According to seattlesymphony.org:

"The premier jazz piano trio of Keith Jarrett, Gary Peacock & Jack DeJohnette hits Seattle as part of a four-city U.S. tour! Celebrating 30 years since their first studio release as a trio, Jarrett, Peacock and DeJohnette bring their locked-in, harmonically unrivaled, rhythmically bolted-down music to Benaroya Hall for a one-night-only concert event."

Tickets are already available directly from seattlesymphony.org ($30-$125).

Thanks to Howard and David for the information.