I have recently had a number of enquiries from families requiring care just till their child starts JK in September. I think that would be a great temporary filler till your newbies start, but I honestly think its hit and miss as to whether or not this clients will be around. Definitely advertise and fingers crossed. I would also advertise specifically for back up daycare. Occasional days due to provider sickness and daycare closures and also to cover the providers vacation days.

There's no harm in advertising this and hopefully if you get your advertisements seen people will call. Another option is school age care during march break and the summer (ARGHHH!!) It's an option that some people might want to do and maybe if you even stipulate for kindergarten aged kids only, then it might be a little easier to tweak your current program to include them and entertain them.