In theory headliners should go last but not always the case… especially in Smaller venues like clubs… my band closed for quite a few headliners… we had a decent local following in the Los Angeles area however the Meat Puppets, Agent Orange, Country Joe “Woodstock fame” (Give me a F give me a U…) and The Nails along with many other acts in my experience all wanted the middle spot… not at all unusual… in the case of the Nails they borrowed our Bass Amp because they blew out they’re own and then Blew ours as well and left us with no amp for our Bass player… they left early and we ended up using the PA system for a Bass Amp… they all chose the 2nd spot over going last. The Nails did follow through and they paid the cost to fix the amp very Decent guys from New York! They had a popular song on radio “88 Lines For 44 women” I hope I’m remembering that title correctly.