"Summer" Activities for Kids in Lusaka

Hi Everyone,
I was wondering what kinds of activities (e.g. day camps, sports camps, etc) there are for kids from June to late August. Unfortunately, our kids’ school holidays don’t coincide with those of the Zambian schools, so we are wondering how to keep our boys (Ages 4 and 8) busy over the summer. Any suggestions would be greatly appreciated.
Thanks in advance,
Adjoa