Well, I'm female, so I wasn't recruited by strippers. But I did get to go to their 'Diversity Weekend' before my interview. They invited out about 30 college kids - women, minorities, and some white males who happened to be in the society of black engineers. They took us to a couple of dinners, saw some sights around Seattle, and we had a full day of mock interviews with real engineers where we got immediate feedback. I had a great time and the interviews were helpful.

Perhaps the event you saw was the sister event for their not-diverse recruits.