I'm a very green ham, licensed several years, just now getting on the air more often. Now that I'm carrying an HT more, and at public events, I've been asked "what's that radio for?" I'm relatively knowledgeable about ham radio technically, but my operating experience is very light. What's the etiquette for calling into a repeater to ask for assistance with a ham radio/repeater demo to promote our hobby? Is this even a good use of the repeaters, assuming they're not already in use?