Trace Adkins, Miranda Lambert, O.A.R., Plain White T's and Jack's Mannequin headline side stages at Summerfest 2008.

Festival officials announced a handful of side stage acts, but the dates, times and locations for the shows have not been determined.

In addition to the aforementioned five, Summerfest signed contracts with 311, Paolo Nutini, Matisyahu, Keller Williams, Creedence Clearwater Revisited, The Crystal Method (DJ set), The Roots, Gomez, Willie Colon and Thievery Corporation.

Summerfest takes place June 26-July 6 at Maier Festival Park. Admission tickets are $8 for adults from noon until 4 p.m. Weeknight and weekend adult tickets are $15. Children and senior citizens can enter for $3 at all times. Children under 2 are admitted free.

Rush, Rascal Flatts with Taylor Swift, Tom Petty & the Heartbreakers with Steve Winwood, Tim McGraw with Jason Aldean and Halfway to Hazard, the Jonas Brothers and Stevie Wonder were already announced as headliners for the Marcus Amphitheater. More acts will be announced in the near future.