Do the side stage headliners play at the same time? Machine Head and Children of Bodom are the only bands i'm a big enough fan of to justify going, but if any portion of their sets overlap that'd be a deal breaker.
04/01 - Mindless Self Indulgence
04/05 - Kataklysm
05/10 - Mastodon/Gojira
05/12 - Down