I found 2 different news clippings from Roth's Birthday party which was held in Hamburg, Germany on the 1978 tour. The band spent 2 days in Hamburg, so the party either took place on 5/7, 5/8 or 5/9. the band played Paris on 5/10.
https://twitter.com/VeryStrangelife/...83186351411201
Warner was on hand and Dave took the cake to the face.