Hey aspiring rapierist!
I recently (within a few months) started a club at my school. What I did to get people's attention was have my coach and a couple people from my club come and do a fencing demonstration at a lunch. I had all the people who wanted to join a club put there name on a sheet that was passed around. Then I found a adult staff member to sponser the club (the VP wouldn't let me do the club without one). After that, things went smoothly. I had a date/time thing sent out to everyone on which days would be best from then, and I chose the day that would be the best for the mojority of people. We now have about 15 fencers in our club, and we're still using a lot of makeshift stuff, since the money hasn't come in for our equipment yet, but it's worked. I used bamboo sticks to show people how to hold a french grip

Anyhoo, we got some money from site council, that should be in soon. Hope this helped! Good luck! Feel free to PM me if you have any other questions.
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-Foil Girl
"If you don't have fun, you've already lost"