So, no actual information regarding this event at present???
Although I'm not sure I'm still a 'young professional' by the BCS' definition (believe the cut off is 25?), and I'm no longer a member of the BCS (see
here for reasons).
I'd suggest moving away from Facebook as a primary communication method. I know plenty of infosec types that avoid FB completely on principal, or (like myself) maintain a clear separation between FB (for friends/family) and my professional life.
Good luck volunteering and trying to get an event off the ground, hope you have more luck than my previous experience with the BCS.