"3KNPen;15514052" wrote:
Unless it has changed I believe Alien Night at the bars happen on Tuesday nights. The theme nights can happen even if you haven't been strictly invited to them you just need to trigger them by going to a bar on the night in question. So have your sim go to a designated Bar (the Get Together ones work the best but I have had triggered theme nights happen at bars that I placed from the gallery so it might work at any of them) not a club or a lounge it has to be a bar and the even should trigger to start up for you.
Just wanted to update and say this worked! I had my sim go to a Windenburg bar on a Tuesday night and sure enough it was aliens night. My sim met the alien love of his life and hopefully they'll have some alien toddlers soon!