Living in the Eastern most province in Canada, I always have to fly everywhere to see mainstream concerts. Cancellation is always my biggest fear because I invest a lot of money on return flights and hotels, as well as time off from work. I have been lucky so far. I only had 1 concert cancellation (Lenny Kravitz, luckily in my hometown so I had no travel expenses) and 1 postponed (Led Zeppelin at the O2 in 2007, in which I paid dearly for flight/hotel changes, which was soooo worth it.)