It's not silly at all. In this area, some things do fill up fast. Starting in January keep your eye out for summer camp fairs. There's a huge range of offerings, so look to what your kid likes, art, sports, etc. and how much coverage you need, e.g. half day, full day, as well as your budget. Many places that offer classes during the year will offer camps during the summer.
There's a list of camps on Our-kids.com:
http://www.our-kids.com/public/t/?f=4&s=119