Scavenger Hunt
Instead of having a junior high-style gathering, complete with "Spin the bottle" and "Seven Minutes in Heaven" make your guests less uncomfortable by having a scavenger hunt.
Just like the Traffic Light party, extend the invitation to as many people as you can. Ask your guests a short list of questions about themselves before the day of - their names, their occupations, weird and wonderful facts about them, etc - and on the night of the party, hand out short questionnaires to your guests without the answers you have gathered and have them hunt down their answers.
It'll be a good way for a meet and greet and it'll break the ice at the same time. The prize is finding someone to go home with.
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