First and foremost if there are problems with accounting ask the National Office for assistance, they also hold a class on establishing a facility budget and setting up a ledger.
When I was the treasure (years ago) we set aside $600 to $1000 (depending on location) for each convention, we then set aside $600 to pay travel expenses to attend NATCA functions, if we had money left over we would try to throw one or two parties for the members each year, purchase flowers for funerals, births, special occasions.
Walking into local accounting problems is not fun, it usually results in hard feelings with the previous local officers, but you need to ensure that all money properly accounted for.