Bob Weir headlined his own Sweetwater Music Hall during a private event last night, playing a brief solo set as a part of the festivities. Among the tunes played last night include “Walking Blues,” “Loose Lucy,” his own “Blue Mountain” and “Only a River” as well as “Peggy-O.” Next up was the Lady Gaga tune “Million Reasons” he covered with Trey Anastasio at Wanee and then a finale of “The…