No idea about the narcotics regulation at SIN - there are other places on FT (and the web) that might help you out there. I'd start in the Other Asia forum.

As far as what goes on at a Do ... here's the offical thread for the definition of a Do (check out the sticky at the top of the forum for more info).

If you like meeting people from different places with a wide variety of backgrounds and interests but with common interests in travel, miles & points then you'll enjoy a Do ... there is a huge one being planned in London for November if you don't want to wait for January.