Hmm bit of confusing information here. Big acts in the auditorium usually need a ticket - I have got tickets for Sufjan, Jeff Mangum and Panda Bear before and I think you would have struggled to get in without one. I think The Magnetoc Fields will need tickets, although never know as they’re playing two nights. Either way, better to just get one when you arrive as even if you don’t need in either it will avoid hanging around unsure in the standby line.