I would like to see some UGC holidays like an independence day (doesn't have to coincide with American indp day or cinco de mayo or any real world day... I actually think a member of the dev team's bday would be a good candidate) Aside from fetishes and sex this day could involve written forms of the dev teams personal hobbies/interests/fetishes.
Then something like Mardi Gras where a bunch of people dude lewd acts in public in exchange for an accessory called beads. Easy day to get exhibitionism points + as special rewards for people with high exhibitionism scores.
Also I think there should be some kind of get together to commemorate your father on his birthday with several cousins who aren't trying to steal the steele fortune, some aunts/uncles and some of dear old dad's former lovers (anno and celise are already technically your dad's sloppy seconds, why not have more?) (including at least one or two males would be nice... because more mens)
Also a collection of gender celebration holidays would be cool. A day to celebrate femininity followed by a day to celebrate androgyny and lastly a day to celebrate masculinity. I would add a herm day but herms are typically fem, masc or andro so just have herm holiday npcs there for each day. We could use these in place of multi-day celebrations like Kwanza and Hanukkah since this is a sex game. Then, for the last day, a christmas themed event that celebrates all genders.