Hmmm so many :D
- I want to set my sim's birthday as holidays - but only if I can customize calendars for specific families. If the calendar's for the whole world, then maybe only the really, really important sims will get special celebrations for their birthdays
- A holiday connected to Vlad. Perhaps Forgotten Hollow Founder's Day or something
- Once we have witches, I'd like to create special celebrations for them, sort of wiccan ritual-type things
- A special early spring celebration, where sims gather to "burn away" the colds of winter (yeah not sure how I'll do that exactly :D)
- Mother's / Father's day
- International Food Day (because every day should be food day :D) ?
Dunno, I'll probably think of other things once I know how it actually works or I see some of the other simmers' awesome ideas xD