If you are reading this in September and have not started your festive campaign, you are not late. You are exactly on time, provided you start today. The Indian festive window is now a ₹ 1.15 lakh crore online event, US online holiday spend crossed $257 billion last year, and the two seasons overlap more each year as Indian brands sell abroad and global brands sell into India. This is our week-by-week plan for the next twelve weeks, built from what worked for our clients last season and what the data says will matter this one.

Key takeaways

Two peaks, not one: an Indian peak in the first week of November and a Western peak in the last.

Meta CAC for Indian D2C brands is up from ₹ 380 to ₹ 502 — every rupee spent warming audiences in September saves three in November.

Phase budget roughly 15% September, 25% October, 45% November, 15% December.

Quick commerce and AI shopping assistants are now festive channels; your product data is a creative asset.

Measure by contribution margin after returns and RTO, not platform ROAS.

The 2026 calendar, in one place

Every plan starts with dates. Here are the ones that matter, with the marketplace sales shown as expected because Flipkart and Amazon had not confirmed as of the end of August.

Ganesh Chaturthi runs 8 to 17 September and Onam wraps up on 7 September. Flipkart’s Big Billion Days and Amazon’s Great Indian Festival are expected around 22 to 30 September, based on the pattern of the last five years. Navratri runs 11 to 20 October, Dussehra is 21 October, Dhanteras is 6 November, Diwali is 8 November and Bhai Dooj is 10 November. For global audiences, Singles’ Day is 11 November, GTA 6 launches on 19 November and will dominate attention for a week, Thanksgiving is 26 November, Black Friday is 27 November, Cyber Monday is 30 November, and Christmas and New Year close the year.

Notice the shape. There are two peaks, an Indian one centred on the first week of November and a Western one centred on the last, with a marketplace sale in late September that pulls electronics and big-ticket demand forward. Your plan needs to respect all three.

What changed since last year

Three shifts should reshape your plan.

Acquisition got more expensive. Razorpay’s 2026 festive report puts average Meta CAC for Indian D2C brands at ₹ 502, up from ₹ 380 a year earlier. Appbrew’s calendar notes CPMs in India climb sharply from mid-September and run 30 to 50% above August baselines through the peak, with cold-audience CPA two to three times higher than warm. Every rupee spent on warming audiences in September saves three in November.

Quick commerce became a festive channel. Quick commerce GMV reached roughly ₹ 95,000 crore in 2025 and demand spikes 60 to 70% in festive week. Beauty, gifting and accessories now move through ten-minute delivery. If your product fits, being listed is no longer optional.

AI is in the shopping journey. Adobe measured a 693% year-on-year increase in traffic to US retail sites from generative AI tools during the 2025 holidays, and AI-referred visitors converted 42% better than average by March 2026. Google’s AI Mode now carries sponsored listings and, through the Universal Commerce Protocol, complete checkouts. Your product data is now a festive creative asset.

Two constants remain. Around 85% of Indian festive traffic is mobile and 56% of US online holiday transactions were on smartphones. Tier-2 and Tier-3 cities deliver 60 to 65% of Indian festive shoppers, and creators are projected to influence around 30% of retail spend this year.

The 12-week countdown

Weeks 1 to 2 (1 to 14 September): Foundations and audience building

Audit last year’s data: which products, which creatives, which channels, which days. Set targets by contribution margin rather than revenue. Fix tracking now, meaning Conversions API, enhanced conversions, GA4 events and WhatsApp opt-in flows. Launch awareness and engagement campaigns at low CPMs to build retargeting pools. Start an email and WhatsApp list push with a genuine reason to join (early access, festive lookbook, a gifting guide). Brief creative for the whole season. Confirm inventory and logistics capacity with your partners, and run a return-to-origin (RTO) analysis by pincode.

Weeks 3 to 4 (15 to 30 September): Marketplace sales and warm-up

If you sell on Flipkart or Amazon, the expected Big Billion Days and Great Indian Festival window lands here. Marketplace ads, deals and inventory need to be locked a week before. On owned channels, start the “coming soon” narrative: preview collections, tease bundles, open waitlists. Launch your creator programme so content is live before the peak; creators need two to three weeks to produce. Turn on always-on retargeting with soft messaging, not discounts.

Weeks 5 to 6 (1 to 14 October): Navratri and the first conversion push

Navratri (11 to 20 October) opens fashion, jewellery and beauty demand. Move from awareness to conversion campaigns with your hero SKU leading and two or three margin-driver products supporting. Razorpay’s advice on a hero-SKU strategy is sound: one product to acquire, a few to profit, bundles to lift order value. Launch gifting collections with emotional creative; save deep discounts for the high-intent windows to come. Test creative angles now so you know your winners before Diwali week.

Weeks 7 to 8 (15 to 31 October): Dussehra and pre-Diwali scaling

Dussehra (21 October) pulls electronics and home demand forward. Scale winning campaigns, refresh creative weekly, and shift budget toward warm audiences and owned channels. Send your first Diwali gifting emails and WhatsApp broadcasts. Localise creative for Tier-2 markets and regional languages; vernacular content consistently outperforms in these cities. Check delivery cut-off dates and communicate them clearly on product pages.

Weeks 9 to 10 (1 to 14 November): Dhanteras, Diwali, Bhai Dooj

This is the Indian peak. Dhanteras (6 November) is the single biggest day for gold, electronics and kitchenware. Diwali (8 November) is the emotional peak. Run your deepest offers here and nowhere else. Push notifications during Diwali week see roughly three times the open rate of normal months; use them, but with restraint. Quick-commerce listings should be fully stocked. Post-Diwali, immediately switch messaging to Bhai Dooj gifting and then to a “you missed Diwali, here is Black Friday” bridge for global audiences.

Weeks 11 to 12 (15 to 30 November): Singles’ Day, GTA 6 week and Black Friday

For brands selling into the US, Europe and Malta, this is the main event. Black Friday online sales in the US hit $11.8 billion last year and Cyber Monday $14.25 billion. Note the attention competition: GTA 6 lands on 19 November and gaming content will dominate feeds for a week, so schedule your heaviest brand storytelling before or after that window and keep the 19th to 22nd for pure performance. Buy-now-pay-later financing reached $20 billion in US holiday spend, so make sure it is offered at checkout.

December: Christmas, New Year and the retention harvest

Christmas and New Year close the season with fashion, beauty and experiences. More importantly, December is when you turn festive buyers into repeat customers. Segment every new customer, launch a post-purchase WhatsApp and email flow, and offer a January reason to return. The brands that grow 110% year on year are the ones that treat the festive season as an acquisition event and January as the retention event.

Budget principles that survive contact with reality

Phase spend roughly 15% in September, 25% in October, 45% in November and 15% in December, then adjust to your category. Ring-fence 20% of the total for retention and owned channels; it will have the best return of anything you run. Keep a 10% reserve for the moments that surprise you, and there will be some. Measure by contribution margin after returns and RTO, not by platform ROAS. And decide your deepest discount in September so you are not negotiating with yourself in November.

The creative rules

Lead with emotion in October, with offers in November. Produce for mobile-first vertical video, then adapt. Plan weekly refreshes, since ad fatigue under festive frequency arrives in five to seven days. Localise for at least Hindi plus one southern language if you sell nationally. Write product descriptions and feed data for AI shopping assistants as carefully as you write ads. And give every campaign a single clear reason to act now: a date, a stock limit, a gifting deadline.

Where Debate Marketers fits

We run festive campaigns for retail, education and technology brands across India, Malta and beyond, and our retainer clients average a 3x return. The plan above is the skeleton of the one we build for each of them. If you want the version with your numbers in it, the best week to ask is this one.

Frequently asked questions

When should I start festive ads?

Awareness and list building in early September, conversion campaigns from the first week of October, deepest offers for Dhanteras through Diwali and Black Friday through Cyber Monday.

Should I discount for every festival?

No. Use emotional and gifting messaging for the smaller festivals and reserve deep discounts for the high-intent windows.

Do I need to be on quick commerce?

If you sell beauty, gifting, snacks, accessories or home essentials, yes. Festive quick-commerce demand rises 60 to 70% in peak week.

How do I handle cash on delivery?

Keep it, but add order confirmation on WhatsApp, pincode-level RTO scoring and prepaid incentives rather than removing the option.

Sources

Appbrew, “The Definitive Ecommerce Festive Season Marketing Calendar for India (2026)”; Razorpay Rize, “Festive Season 2026: What D2C Founders Need to Know”; Redseer festive GMV reporting via IBEF and Business Standard; Zoutons on expected Big Billion Days 2026 dates (as of 31 August 2026); Adobe, “Holiday Shopping Season Drove a Record $257.8 Billion Online” (January 2026); Adobe Analytics AI-referral conversion data (March 2026); Take-Two Interactive on the 19 November 2026 GTA 6 release.