Here is a couple thoughts.... These are from the top of my head and some from other clubs I am members of.
Monthly meetings..... Pizza night or meetings on a weekend so us out of towners can come visit. Work, kids, and 2 hours away I cant do a wednesday. I saturday I can coordinate for.
A frag of the month..... Club funds buy a bigger mother colony that is then fragged up and sold at the meeting. Vary it SPS, LPS, chalice etc. Post it on a certain day, generate some interest, reserve/pre-sell half, then save the other half for a blind drawing based of people that register/sign in at the meetings. Make is so people that pre-reserve one month have to wait a month before reserving again, so the wealth gets spread of the opportunity to get one in advance. A $200 colony fragged into 10 pieces and sold for $15 or $20 a piece generates funds pretty quick.
Bi-monthly frag swaps.... Every month swaps gets messy you need a place with power, accepts spilled water, etc. Bi-monthly also gives people some time to plan ahead, look at their grow outs, etc. Plus Monthly turns into a handful of people all selling eagle eye & dragon eye zoas to each other. Still keep it local club members only. Save the businesses and big deal for the semi-annuals.
Tank how-to's & a raffle.... SEAS in Springfield did a great job with this. They build a project tank over the course of the year, and sell raffle tickets so at the end of the year someone walks away with a great prize. Each meeting they drilled it, built a rock wall, plumbing, etc etc. Each month was a how to & hands on so people learned and got hands on doing it. Talk with enough local shops I'm sure you can find project sponsors or at least local shops that will help sell raffle tickets. It's win win cause they will be making money once stocking begins too. All the way around it brings in knowledge, learning, members, local businesses, like a community project. Plus the raffle helps bring in club money.
Someone mentioned a grow out contest..... Great Idea.