@Zaku, when a party happens, jellies post happy tidings, everybody gets lurved. Lurved flies every which way for a couple of days. The slow down lasts a week or two, and finally the party ends.
When new members join, all sorts of old questions pop up to them at first, and so it is possible they comment on a two year old party. If they feel curious, they could end up on something even older.
After my absence, my comeback tossed my new identity some old stuff with participation from the vampires.
I’m not going to dig for old parties, but if any come up in somebodies feed, they could post a link here, and I would go back for a look see.