Conversation so far:
What does the word proper' symbolize?
CANNOTANSWER.
Did something specific happen during this time?
Tritsch was not ready in time for the sessions.
Did Gong ever do any films with his proper beginings?
The re-born Gong played its debut gig at the BYG Actuel Festival.
Where there more gigs during this time frame?
Magick Brother was released in March 1970.
Were there any other releases?
April by a non-album single, "Est-Ce Que Je Suis; Garcon Ou Fille?.
What happened in 1971?
Houari left the band in the spring of 1971.
How many band members were there during the proper?
CANNOTANSWER.

Question: Did anything else big happen during those years?
Self-contained rewrite: Besides Houari leaving the band Did anything else big happen to Gong during 1969-1971?