It can be a little overwhelming trying to figure out what you'll need at an event. From the obvious (a tent!) to the smaller items, I've taken the liberty of referring to those with years of experience who have created a wonderful checklist for you to use!
Pennsic War Packing List This is from Alexander the Lost's wonderful Pennsic War site. Pennsic is the granddaddy of them all, and these should REALLY help you survive smaller events!