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Venue should have RCDs on the sockets, however using your RCD for all the equipment would afford protection for anyone plugged into the extension lead.
It's also important to remember that an RCD does *not* guarantee safety - because they don't lift the earth connection. It's a worthwhile protection against a fault on *your* equipment or supply, but it's possible to have your own equipment working perfectly and fully earthed, and get a shock from something else live which is on a different circuit - eg a mic going via a multicore to a mixing desk at the other end of the room. The current will then find the best path to the good earth - through your equipment, and you. An RCD will not save you from that - in fact it won't even trip.
As jpfamps said all venues *should* now have RCDs on the sockets and/or a modern distribution box with an earth-leak detection circuit, so things are not as bad as they used to be.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It doesn't make any difference to the operation of an RCD since they don't rely on detecting leakage to earth - they essentially measure the current in the live and neutral and if there is a difference - the 'Residual Current' - which must have gone somewhere else, they trip. That's why they can be used on 2-wire equipment such as lawnmowers.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein