Could you give a bit more information?
What isn't working?
Do you have any mods or CC (custom content)?
I have nothing installed except for the game, no CC or mods. Whenever a sim invites mine to do sth or comes over it opens the social event bar and it´s blank. Also when my sim is invited somewhere it just goes unnoticed, he/she stays home as if nothing.
Could you share a screenshot of the social bar you're getting? Does the bar work when you plan an event?