I'm free on Sundays...
I think that whichever date is picked, half of us won't be able to make it, and half will.
Maybe instead of picking a single date now for the first one, perhaps start straight away with it as a monthly thing. Say, decide now that it will be every last sunday of the month, or every second saturday, something like that? I know that I would remember that way rather than dates
I think it would be good to make the social one a night time thing on weekends, that way those of us who work during the day could still make it. I'm not sure that many nightshifters work weekends, not sure?