Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
When promoting it (or other BALUG meetings), *please* use 7:00 P.M. as the primary time mentioned regarding the meeting and such.
I recommend keeping it simple, by sticking to that.
If you start talking about 7:10 pm, regardless of what you say about it, a certain percentage of people will _think_ 7:10 pm, show up 5-10 minutes after that, and act aggrieved.
So, just consistently say "before 7:00 PM".