Depends on how big of a stage you have. Most of the ones I was on were already occupied by the house band's gear that we had to set up around, and the only place to put a case was behind the P.A.
Couldn't lay it on top of my amp or behind it without shearing off a speaker cable, or resting it against their gear.
Otherwise, there was the pinball machines, which were in use, or the jukebox, which had a sloped top. Only place for my case was in a corner behind something, and it took more than just a few seconds to get it out.