Have a look in coffee shops and cafes for HK magazine, not very parent focussed but does tell you what's going on each week. The List has occasional parenting editions and features, also can be picked up at cafes, there's also one called Playtimes which I've seen in playgroups and doctor's offices which I think is much more parent focussed, I haven't actually read it.
There's lots of discussions of playgroups and playdates on here if you do a search, that should give you a good idea of what's in your area as well .