| Talk to whoever does the maintenance / equipment ordering for the gym. They should have a catalog, and in it should be a kind of non-marking plastic tape for temporary lines.
Do *not* use the kind of paper tape used for painting. If you put it down for a day for a tournament, it'll come up with few or no problems on a well-finished floor. If you *aren't* lucky or if you leave it for more than a day, you'll spend *hours* stripping the residue off, and you'll be very lucky if the floor doesn't need some serious cleaning and buffing which will tick off the gymn maintenance big-time.
We've used the paper tape for one-day markings successfully many times, but when we had to use a gym for regular practice for a year or so, we got screwed by the residue (and the way the buffers dissolved the paper and spread a gummy mess around).
Take care,
PGE
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