Has your Sim ever been invited to another Sim's party - birthday, whatever?

Yes - my sims seem to get invited to everything - naturally the Sims that get the most invites is my loner Vampire slayer who would rather not go to parties to start with. I suppose if I was wishing my sims would get invites - they never would - but the ones that detest that sort of thing gets constant invites to everything one can be invited to.

That said he has attended two birthdays and strangely both were for Vampire children. I guess the game wants my sim to know who the next vamps will be or something. My sim is unmarried and has no kids either - so I found it strange he was invited for those. He went though as a Vamp he is smitten with lives there in Vllads house.