Fans' demand for seats at a May 2 concert by Jason Mraz has prompted a venue change from the (sold-out) Blaisdell Concert Hall to the more expansive Waikiki Shell.

Those who already have tickets need to exchange their seats for similar reserved seating, beginning Saturday at the point of purchase. Ticketholders should call 877-750-4400, go to www.ticketmaster.com or visit the outlet where orders were placed. The deadline to switch seats or get a refund is April 26.

At 9 a.m. on Saturday , general admission tickets for the Shell show will go on sale for $25 at Ticketmaster outlets. Reserved seats will go on sale after Blaisdell tickets are reassigned.

Mraz, whose latest hit is "I'm Yours," is a Grammy-winning artist whose third studio album is due to be released this May.