lostlivedead post on canceled Ontario Motor Speedway show provides good context on these gigs.

cxl. KG column of 5/4/73 says these will be May 21-22, with the NRPS and Willie Nelson. Replaced with single show at Kezar 5/26.

ref: Scott et al. 1995, p. viii;

listing: "Artists Calendar," Rolling Stone, 6/7/73, via psychlops post to DNC, 6/6/2010;

ref: Staska and Mangrum 19730504.