That sucks about that coffee shop. It frankly doesn't sound like a good music venue if it provides no accommodations for musicians. I hope they paid you a lot for the hassle of having to bring in all that equipment. If they didn't, I'd say don't take those gigs in the future. That may be the reason they had to get out-of-towners to play it.
The catering example falls into the general delivery use case. Yes, there's still going to be a need for delivery vehicles. But they need to be made much safer (right now they're the #1 cause of death for cyclists, and they kill a lot of pedestrians too). And when we get rid of most of the cars, at least that'll free up a lot of on-street space for loading zones so you won't constantly see trucks that are illegally double parked or blocking bike lanes.
Specifically on the truck safety issue, we need trucks that adhere to pedestrian/cyclist safety standards, i.e. smaller, non-articulated ones that have full skirts all the way around that prevent people from being driven over in the event of a crash. Right now we have all the way up to full semi-trailers driving through the city (which are illegal but the cops don't enforce), which make super wide turns and can easily sweep people under the wheels and crush them to death.