How to make someone appear? (Explaintion inside)

So in my game Demon Seals the player gets a base and can recruit characters. The player can also change their party members. My question is how to have it to where A.) How to have the characters appear in the base? Mind you some of them are shop keepers and such. B.) How to have the characters appear in the base that aren't in the party? The only characters that shouldn't appear in the base so that the player can talk to them are the ones that are actually in the party in at the time being.


Sorry if this has already been answered as I couldn't find the answer and this is kinda important from my game.

A Use a switch for when they are recruited and make the event appear when the switch is on


B Add a second page empty to happen when character is in the party