Grateful Dead, Big Brother 1967 "Trip or Freak" Concert Poster (AOR-2.183) . An original first-printing, concert poster from Halloween 1967 at San Francisco's Winterland Auditorium featuring the mega-lineup of the Grateful Dead, Big Brother and the Holding Company w/Janis Joplin and Quicksilver Messenger Service all playing on this night. One of the most demanded Grateful Dead posters of all time. The poster invited attendees to "Trip or Freak" , a lysergic soaked "Trick or Treat" pun. The poster feature an image of Lon Chaney in his role in Phantom of the Opera " Measures 14 1/4" x 26 1/4" CGC-graded 9.0
- Performer: Grateful Dead
- Venue: Winterland Auditorium
- Dimensions: 14 1/4" x 26 1/4 "
- Date: 10-31-1967
- Printing: OP-1; Poster CGC Graded 9.0