I think people will be appearing as NPCs throughout the campaign. I think it's a good idea for a performance game.
I pro DM live site-specific D&D games with elaborate props, handouts, terrain, etc and we use actors in the roles of major NPCs at those events. Works quite well. And it's a help to the DM when occasionally you want more than one important NPC "on stage" at the same time and don't want to play them all yourself, and don't want to run the NPC ally during combat when you're also running all the enemies.