I'll take a guess as to what happened. As we typically do, a specific post was made by someone for our normal 3rd Saturday meeting. In this case I wondered if some would possibly mistake it as an old post thinking it was for August 3rd vs. the 3rd Saturday of August, thus ignoring it e.g. "August 3rd Saturday".
- An email was sent to individuals by the original poster. (not typical)
- The meetup was posted by the same person on ClubCobra. (typical)
- Some read it, some didn't. Those who didn't got left out. (typical)
Recommendation: Look for specific posts that call out specific get-togethers and times on the NorCal Cobras forum. If you are not sure, send one of the folks on the thread a Private Message on ClubCobra and ask them. Or, make friends with folks, email them, or call them on the phone to confirm.
Better luck next time.