Sugarland Concert pre-party is April 16 The Ralph Engelstad Arena has announced the official Sugarland Concert Pre-Party will take place from 5 to 7 p.m. Thursday, April 16, in the Betty Engelstad Sioux Center. Get the party started early and register for your chance to win a pair of front row tickets, the chance to meet Sugarland, enjoy pre-concert food and beverage on site. The pre-party is presented by 97 KYCK and CAT Country 100.3 and is free and open to the public. Event guests do not need a concert ticket to attend the pre-party. Doors to the pre-party open at 5 p.m. For more information, visit Ralph Engelstad Arena at www.theralph.com .