Furthur/RatDog keyboardist Jeff Chimenti and indie-folk guitarist Jonathan Wilson have joined the lineup for this evening’s benefit for wounded warriors at Mill Valley, CA’s Sweetwater. The evening’s previously confirmed lineup already boasts The Mooncussers—featuring CNBC senior economics reporter Steve Liesman on guitar—as well as special guests Sammy Hagar and Bob Weir. Wilson and Weir shared the stage at a TRI tribute to Jerry Garcia in August. The collaboration went so well that Wilson sat in with Furthur at two LA-area shows earlier this month.

The entire event will be streamed for free online, too.