We are focusing on areas where Entrepreneurs meet, from various Meetups to TechCrunch events.
Like all things we recommend that your company has a strategic game plan and execute on it.

We do sponsor and actively run certain events:
Going Green! Meetup
StartupEpiceneter
EpicenterForums

We do recommend that you look at existing groups such as SDForum.
As an entrepeneur you'll be short on time and cash, so choose wisely.