I think specific information should be given the organizer Bro Madhouse himself. I don't know where he is. Did not see him online during the day.
Just my opinion, meeting at a point, waiting for others and then leaving together ... it just results in everybody getting late.
Again, just in my humble opinion, I suggest that people should reach Tarnol Toll Plaza at 10 am. The average run to Kalllar Kahar is approximately 2 hours. So in that case, you will reach the venue at 12. Grab your lunch, freshen up and then our GTG can start at 1 pm.
Those who are traveling in the form of groups should leave earlier to cater for extra time required to pick up friends.