Insurance Issues
Check first with your own art. Often there is an org you can join that will cover your students, doing your art. Often this coverage extendt to travel to and from (sanctioned) events. For example the Americian Judo & Jujitsu Federation oversees Danzan Ryu jujitsu students throught the J. Allen Flood Co.
Training group or super sized McDojo you need insurance.
Good Luck !
Gregory Poretz
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Remember, in life you are only as old as you feel.
In Judo, you are only as old as you feel when you get back up.