December 2025 Marketing Calendar: Key Dates, Gifting & Party time 🍾

The final countdown is on. From peak gifting weekends to last delivery deadlines and the early signs of Boxing Day prep, December is a whirlwind for digital marketers. Whether you’re focused on paid ads or organic strategy, this month is your moment to close the year with a bang, and start teasing 2026 while you’re at it.

5 December - Bathtub Party Day (Fun, Global)

A light-hearted day celebrating self-care and relaxation. Quirky? Yes. Great content opportunity for beauty, wellness and gifting brands? Also yes.

Content Tip: Share pamper-night product edits, gift sets for bath lovers, or run a UGC challenge encouraging cosy, calm nights in.

10 December - Human Rights Day (Global)

Commemorating the adoption of the Universal Declaration of Human Rights. A day for meaningful campaigns, especially for purpose-led and B Corp brands.

Content Tip: Share your brand’s commitments to ethical sourcing, DEI, or partnerships with relevant charities.

14 - 22nd December - Hanukkah Begins (Jewish Festival, Global)

The eight-day Jewish celebration of light begins on 6 December and ends 14 December.

Content Tip: Celebrate inclusively - spotlight candles, gifting moments, and food. Avoid stereotypes and focus on authenticity and warmth.

17 - 23 December - Final UK & International Delivery Cut-Offs

This is the week to shout loud and clear: last chance to shop for Christmas. Use urgency across your emails, ad copy, site banners and social to make sure no one misses out.

Royal Mail’s last recommended posting dates for Christmas 2025:

🇬🇧 UK Domestic

• 1st Class / 1st Class Signed For®: Saturday 20 December

• Royal Mail Tracked 24®: Tuesday 23 December

🌍 International Standard & Tracked

• 3rd - 10th December - Make sure you check for each country. 

Content Tip: Build urgency with countdowns. Highlight key shipping cut-offs in all touchpoints.

25 December - 🎅Christmas Day (Global)

The big day. If you’re not switched off, don’t try to sell. Opt for heartfelt thanks or reflective, feel-good content.

Content Tip: Share a brand ‘thank you’ video, or a simple message showing appreciation for your customers and team.

26 December - Boxing Day (UK, Canada, Australia)

Traditionally a huge retail moment, Boxing Day still draws attention, especially for savvy sale shoppers.

Content Tip: Prep your sale messaging in advance. Make it clear, bold, and ready to go live early morning (or even late on the 25th). Tailor paid ads to push specific deals and make your discounting strategy clear.

Bonus Ideas to Fill the Calendar

Not every campaign needs to be peak season - here are a few fun or thoughtful dates that can fill the gaps and add flair:

• 11 December - Christmas Jumper Day (UK)

  In support of Save the Children. A brilliant opportunity for workplace fundraising, fun UGC, and showing personality.

  
  

• 12 December - Gingerbread House Day Quirky, US-led but globally engaging - ideal for food & drink brands and festive baking content.

  
  

• 21 December - Winter Solstice (UK/EU) The shortest day of the year, a seasonal shift perfect for reflection, slow-down content, or encouraging a final pre-holiday shop.

  
  

🔹 Final Thoughts

December can feel overwhelming, but clarity is your secret weapon. Keep your delivery cut-offs front and centre, plan out your post-Christmas messaging now (yes, even your 2026 teaser lines), and don’t forget, Q1 campaign prep starts NOW!

---

4M Digital is a paid media consultancy specialising in Google Ads, Microsoft Ads, and Paid Social campaigns. With over 15 years of expertise, we help businesses unlock the full potential of their digital advertising strategies through tailored management, audits, and training.