When I saw this thread I also went in wanting to give you encouragement, having made many close-call shows before, but sorry to say I actually laughed out loud when I saw the time frame. I think the 54 Below shows are a good idea, though!
As an aside, last summer I was visiting London and were supposed to arrive 11 AM on a Monday, and see Cursed Child at 2 PM and 8 PM Tuesday (the next day). Due to a storm that made us (and seemingly the entire NE United States) miss our connection, we were delayed more than a day and ended up getting to the theatre 22 minutes before the show started. This was after flight finagling that involved redirecting to Toronto, clearing customs, running to the counter, and begging to be put on a flight that left in less than an hour on Monday night. In summary, thank you to Canada Air.
Hamilton Emotional Support Group:
https://www.facebook.com/groups/hamiltonsupport/