I have all 15/16 posters in my IOS game. I have the stuff for the last one, but I have been building up my "stash" for the next time we have a mini event for an attraction or something. So in the morning, I will send someone to do the poster, collect from the people doing tasks, so that hopefully they will drop the items I just used to max out.
In Windows, I still need 9 more.
It always used to be in events, there was a time where you could "catch up." Now they've added so much to do, that each section just doubles down on the pain from being behind at the start. And, oh, yeah, I head to my Dad's house in Florida on Tuesday, so that will limit my ability to collect whatever, or work on tasks to unlock Hector's final item, if I have managed to get Abuelita by then.