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Summer Programs for 3 Year Olds
Which language? If you are happy with Dutch, you might find most ASBLs providing "speelpleinen" "sporkkampen" have yet to finalise their Summer programmes, but here is a taster of an ASBL in Overijse, its website has details of their stages from last Summer.
http://www.speelplein-overijse.be/page.php?mid=6&pid=11
If you are looking for French, you are going to have to go north to Brussels or south to La Hulpe/Rixensart area.