I would have no problem with my BF sleeping over a female friend's place in some cases - in fact, I can think of eight different scenarios right off the top of my head that I would be totally fine with. What you're describing, however, might be one of the few situations that I personally would not be okay with. The pre-planned nature of dinner, a movie, and a sleepover is very date-like, the fact that it sounds like you weren't invited to this get-together, and the fact that other options for getting BF home were not considered (cab, catching a ride with you or a friend, maybe planning this on a day when catching the bus home is feasible, etc...), it all sounds really suspicious.
And as for hanging stuff from her ceiling... if she is hanging anything that needs wiring (like a ceiling fan or a chandelier) or anything that's heavy or complicated, I am surprised her apartment complex is letting someone unauthorized do it. In the last complex I lived in, they were very clear that residents were not to undertake anything more than simple hanging jobs themselves - the complex handyman would come in and deal with anything more complicated to ensure that someone who had no idea what they were doing didn't damage the wiring or the ceiling. So, this sounds kind of like a strange request to me, even though I know my one experience doesn't mean all complexes are like that. What could she possibly have to hang that would take a long time? And if it won't take a long time, why this whole dinner and a movie thing?
The whole situation just feels off to me. I wouldn't be okay with it.