While you could stay in a nearby hotel, we think the best way to experience Provinssirock is 48 hours of nonstop fun with a small break for needed rest. We think said break should be done in the festival camp site, where you'll soak up the community and camaraderie that made festival going so much fun in the first place.
Gear up properly
It's pretty crucial to bring a tent and some bug spray. The latter will be a boon whether you sleep or not.
Stay longer, hit another show
If you stick around the area into July, don't miss Seinäjoki's other big festival: Tangomarkkinat, the world's oldest tango festival.
Helsinki is the largest big city in the area and the most likely entry point for international travelers. The easiest way from the capital to Seinäjoki's is via train on Finland's rail system, a trip that takes about two hours and 40 minutes. You could also rent a car and drive in, but this takes significantly longer (around four hours).