As far as I know it used to be that everyone with a Midas is welcome, not just members. Of course only members can make use of the tent and BBQ. But anyone with a Midas can park his/her car on the Midas display. It's a day for all Midas enthusiasts, not just members.
Else we end up as the GTM club/Team GTM. One field for the Midas club and one field for the Midas Forum Group/enthusiasts/non members. I suggest we don't want that.