Finding appropriate guest speakers when you live in a small town can be difficult.
When our club first began, and we had a large membership, we had a sales table. Didn't have to be aquatic and a percentage of the sale went to club.
We also had a table show. Each meeting we would select a different class or group of fish to be entered and this would be mentioned in the newsletter before the meeting so members knew, for example, that this month's show was for "livebearers", "barbs", "pairs" etc. Members brought their fish in small Critter Keepers or jars. The room was kept warm so heating wasn't a problem.
We also ran a monthly raffle. Each member brought a food item to go in the raffle and the winner took the lot. The raffle paid for the hall hire ($8 a meeting) with more left to bank.
We have had demonstrations of tank landscaping, how to set up a specific type of tank, tank building/repairing, filter maintenance, plant care, and once did a demo on how to change the diaphragms in the air pumps.
Another interesting evening was when we handed all members some empty film canisters and asked them to bring them to the next meeting with a water sample from their tap, and samples of water from their tanks. They were also told to bring any pH test kits they had. We then compared the readings and the test results. We had new kits, old kits, and very old kits. We had test strips, drops and electronic meters. It was interesting to see we got the same readings from all the kits so pH kits are accurate, no matter how old! The electronic meter we used was highly accurate and recently calibrated (borrowed from the local salmon factory). It was also interesting to see what a wide range of pH tanks were, and how the same species of fishes were being kept in widely differeing pH's, and all doing well, despite what the books said their pH prefernce was.
Guest speakers can be difficult. Try a local MAF person, if you have one, or whoever on the council is responsible for control of pest plants. You might find that a number of members also have another interest in common. Get a speaker on that topic. Our local MX5 club realised the majority also had 4WDs so one of our runs was a 4WD trip through the Mangatapu Ranges.
Got a local mini golf? As mentioned, Kapi-Mana went Go-karting. A local aquarium? Paintball. Anyone able to organise a team game indoors? Bowls, netball, cricket etc.