News of this family reunion in the Hawkesbury came through on two Rootsweb mailing lists to which I am subscribed yesterday so I guess the organisers are trying to get the word out.
This is part of the messages that was posted:
"All descendants of John GRONO & Elizabeth BRISTOW are invited to attend a family reunion to commemorate the 214th anniversary of their arrival in Australia on the "HMS Buffalo" in 1799. Related family surnames are BOOKS, HALL, HARTLEY, McKENZIE, MITCHELL, MOBBS, and SMALLWOOD."
Full details for the reunion to be held on Sunday, 5th May 2013 can be found at this website