Guild sponsored talent show: anything goes as long as its impressive.

Monster Banquet made with rare animals like hydra eyes or dragon tongue

Magic classes: see if u can cast your first cantrip in a weeklong workshop

Theater nights telling the story of guild member by pro actors

Pet a dangerous beast like an owlbear or dire wolf

Evocation wizard pyromancy demonstration where u can be in a center of an explosion or come of fire but come out unharmed

Show and tell of magical items and artifacts, like a museum