Only the night’s headliner requires a separate ticket to see.
Each year, many of the top musical artists in the world, as long as many long-time favorites play at the festival.  The best part about Summerfest is that a reasonably priced ticket gets you in the doors to see a vast majority of the acts.  Only the night’s headliner requires a separate ticket to see.  Once inside, you can hop from stage to stage checking out the great musical acts, enjoying great food and drink, and soaking in the atmosphere.