Have you tried visiting the purist yet ??.
They are the most active in Singapore if not most part of the world.
In fact you can join some of the dinners that the watch manufacturer host with the purist and mingle with most of the enthusiastic watch collectors there.
All you need to do is visit the forum and check out some of the post.
Gathering are almost guaranteed to be always fun and informative, just check some of the post of gathering that we have.
The above is actually based more in Singapore but server is in US and we do have many friends from other countries that comes to Singapore often, sometimes just to attend watch talk or events. You will probably find most of the event are based here in Singapore.