Bicycles not returning to sims inventorys, coffee cups and festivals left out

Could you describe a bit more what you are seeing with the bikes ? Are those NPCs leaving them all over the place or your active Sim ?

For the festivals please use this thread: Overlapping festivals | EA Forums - 4969029 

Litter currently only has a thread at AHQ:  San Myshuno full of Litter

That said, the issues are probably connected.

Did you build any residential rentals in Brichester (although Dorms might also cause the issues)