Tickets go on sale today for the fifth annual Kokua Festival, April 19-20 at Waikiki Shell, featuring founder Jack Johnson, Dave Matthews (with guitarist Tim Reynolds), Paula Fuga, Go Jimmy Go and Mason Jennings.

The music begins at 4 p.m. (doors open at 2:30 p.m.).

Tickets: $40 general admission lawn seating, $50 reserved, $125 reserved pit area, $20 kids 3-12, free for keiki younger than 3; available at Ticketmaster outlets. 877-750-4400, www.ticketmaster.com.