Hi,
I am not sure what your definition of "playgroup" is. If you are looking for a childcare center there is one in Pfaffikon Schwyz - KiddiesCare. It is bilingual - they have english speaking trained childcarers with german speaking helpers.

Otherwise I am trying to organise a get together either this week or the next of some mothers and babies in Zurich. Let me know if you are interested.

S.Hobi