used2bcow,

Firstly, you need to have lots of candidates whom are single... and a right mixture of gender & age for the meet up
Secondly, you would need to have a eatery/pub/area for the meet up...or you can organize an outing adventure
Third, you need to have a game plan to break the ice
The rest, you can leave to the participant's chemistry already...

The obstacle you need to overcome are getting rid of:
- player
- married person (male & female)

Good Luck