This could help with your 2026 planning.
TikTok has released a new set of regional marketing calendars, highlighting all the key events in your region that you should be planning for with your tie-ins.

As you can see in this example, TikTok’s event calendars provide an overview of key seasonal considerations, as well as notes on which TikTok advertising tools are best suited to assist in capitalizing on these events.
As explained by TikTok:
“From Valentine's Day to Summer Holidays, Black Friday and more, there are multiple seasonal moments for every business to get behind. With so many important dates, it can be overwhelming to know where to start or what to plan for next. But good news: to jump start your strategy, we've created a marketing planner with key cultural moments and dates to align your brand to, whether your goal is driving awareness, consideration, or sales.”
There are summaries of all the key dates to remember in each period:

As well as a full calendar of key dates of note:

It’s a handy guide, which could help you stay on top of seasonal events and celebrations that may align with your promotional efforts.
As noted, TikTok has published several different regional variations of its calendar, to ensure that local events are highlighted, and that you stay across all the major moments of note throughout the year.
And with TikTok now playing a bigger role in how people connect, and how people celebrate, it may well be worth downloading a copy of your region’s TikTok calendar to ensure that you’re maximizing your opportunities.
You can download the TikTok even calendar for your region here (with email sign-up).