 In addition to the planned rides for those attending, there's live music and flat track racing. For details, visit PendletonBikeWeek.com. With an excessive heat warning issued for Walla Walla and surrounding communities beginning tomorrow and continuing through Sunday, the Walla Walla County Department of Community Health says the First Congressional Church will offer a voluntary cooling center located at 73 South Palouse. Air conditioning, hydration, and Wi-Fi will be provided both Saturday and Sunday from 11 a.m. to 7 p.m.