Favourite custom/DIY holidays

[LadyThyme]

My Sims all like to garden so I usually play on long lifespan with 14 to 28 day seasons. That does mean that the seasons end up feeling somewhat lacking to me in terms of holidays. And I've been wanting to add some.
What are your favourite cc/DIY holidays?

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[Highlander]

I always add Simdependence Day. Fireworks, Barbecue, Water Sports, Drinking and Streaking. Fun holiday since it gives you a good reason to go to a pool venue and light some fireworks. The streaking part is kind of funny. There are a lot of sims who just decide to walk around naked.