The number one issue at these events (or at least the geeky ones I go to) is everyone sticks like glue to the people they already know. Safety in numbers and all that. The article only briefly touches on getting into conversations (in "Go to the party alone") so a few things that work for me:
- Getting talking to a big group is hard; it's easier with singles or couples.
- The drinks or food line is a chance to get talking to people when they've peeled off from their group. Chat to the person behind you (it is easier to initiate eye contact). If the conversation is promising and it's an open bar, ask them what they're getting when you place their order. Saves them a bit of time and keeps the conversation going.
- People standing around a table? Say "excuse me", put your drink/food down on the table, and start a conversation. Leading with something about said food/drink is the obvious way to start.
Yes, food and drink are really handy props!