Big brother the holding co avalon ballroom san francisco concert 1967 us promotional only 5 x 7 12 postcard for the june 8 11 1967 concerts at the avalon ballroom san francisco which featured big brother the holding company canned heat congress of wonders north american ibis alchemical co the family dog was a loose collective of free spirits managed by chet helms a contemporary of bill graham who put on rock dances at the avalon ballroom more or less continually from 19