Hmm. That's weird. You should indeed be able to click on them (to invite them to the wedding). Once all of them have been invited, the church will show next (I forget if it's saturday or sunday :D ) when you told Mia you'd be there.
Let me see if I can reproduce it on my side. Unfortunately, I'm deep in the middle of writing Love of Magic Act II, so it might take a while, sorry.
I have replayed all the game on android and saved before the invitations to see if I did something wrong: i invite chloe, derek and susan. But then nothing happens.
By the way, Pam disappeared from the gym and I can't invite her it seems (I have seen in a forum that this was already a bug that was reported)
Besides that
No new sites on the map, no church. No new charachters to invite, no phone calls or emails...
I guess it is a bug of the android version? Or am I missing something?