How do you call a meeting? I've look for the option and couldn't find it. The only way I've been able to go to mementos or to a palace is if one of the team mates brings it up, and that doesn't happen every day. Last night I had about a week to kill and didn't have the option to go to mementos.
to call a meeting you simply travel to the current hideout.
also if you have mementos needing investigating you have to view requests and discuss before you are allowed to jump in...