Yeah, I have some memories of some of those events too, a bit from the other side though... I can remember trying to persuade members at one club to get some food out of the kitchen as well as free alcohol or things were going to get more than a bit out of order... I never knew at which clubs a little excess was business as usual, and at which clubs there might not be an event the next year.
What's quite amusing is reading between the lines on some of the 1920s/30s material I've been researching for history on the Canoe website: your great grandfathers don't appear to have been especially cautious drinkers, let alone the amount they would drink and then drive... No wonder the death rate on the roads was so appalling back then...