Agree with the informal approach.
For instance I am arranging the Coombe Mill run in July.
What might be an idea though is to put down an outline plan of what might happen during the year.
For instance the 10th Anniversary Celebration " Event" for TM.
A meet up point at TOTH/ Chateau Impney.
We probably need no more than six Events throughout the year?
Whatever we all agree or is the concensus ...count me in!