On Saturday night, the biggest name in Maine rap, Spose, plays with rockers Rigometrics at the Bangor Arts Exchange. Saturday is also May the Fourth, so Bangor Beer Co. has a “Star Wars”-themed party set for that evening. All weekend, Some Theatre Co. presents “James and the Giant Peach” at its theater space at the Bangor Mall. On Sunday, the Kotwica Band will play eastern European music alongside a community potluck at 4:30 p.m. at the Keith Anderson Community Center in Orono. And Saturday is the Kentucky Derby, so if you’ve got a big hat, you have a great excuse to wear it.