Talk:CanceledShows
In this interview, James mentions that a London date was scheduled in the middle of their current tour, postponed until September (first known European date is 1991-09-01), so this postponed show must have been originally been scheduled in London in July-August 1991.
https://www.splra.org/wiki/images/Tsp1991-07-12interviewb.jpg
1993-06-04 likely cancelled due to delays recording Siamese dream. Green Day may have been added to the bill later.
Description by Rich Menning of Atomic Records:
"When the rain hit, the rest of the event—headliners Agent Orange and The Dickies (along with Tar and The Didjits)—was moved inside to The Unicorn club."
Article about a cancelled show at UNF Arena Jacksonville, fall 1996. It's possible this show was cancelled to accommodate the re-scheduled shows that were pushed back from earlier in the year.