The title pretty much says it all.

I live in the tech center in my city which means a lot of office parks and, as a result, more people are out during happy hours than at night. More often than not people at happy hour are attending with co-workers, which I imagine could pose some challenges to game. Additionally, though the alcohol is flowing, there isn't the same intent as hitting the bar late at night. This may vary from city to city, but in my experience it seems that the majority of folks at happy hour intend to go out for a couple hours, have fun, and blow off some steam after work, with no intention of continuing this into a late night - I've actually met a lot of people who will go to happy hour until say 7 or 8, then just head home for the rest of the night.

Any experiences with happy hour game? Any suggestions to improve success rates at this time of day? Any major things to consider?