Meeting other mothers with baby/toddler

Hi everybody,
I live in Ixelles, Chatelain area. I have a 14-month old little boy, and I'd love to meet other mothers with young children in the area, maybe organise playgroups.
During summer, I often met other parents in the Parc Tenbosch, which was great. Now the weather's gone bad, and I miss these encounters - I'm sure my little boy misses them too :-).
I sometimes go to the "maison verte" La margelle, but now it's closed until november. So if you live in the area, and you woild like to meet up, let me know!