Back in the late 80s we went to a Capital Radio Reggae Sunsplash event in Alexandra Palace. The artists - Ziggy Marley, Maxi Priest, et al, were using Simmons electronic drumkits - the technology was relatively new and not very reliable at that time.
First artist came on and performed the full set however problems with the drumkits led to (roughly 45 minutes) delays with setting up the subsequent artists which led to their sets being around 15-25 minutes.
Lots of unhappy punters and no suggestion of refunds. I think I still have the tickets in a safe place.