Robert Scoble blogs from the Microsoft company picnic. Although he writes, "Microsoft holds a picnic for its employees every year," this suggests that the picnic is organized by Microsoft. It isn't.
The company picnic is run by a professional company picnic company. They also do the Alaska Airlines company picnic, and probably those of many other organizations who don't put their picnic information on the public Internet. Wander down to Mountain Meadows Farm any weekend during the summer and you're likely to see a picnic or other group event under way.