For those who want these to happen they really are not that hard to spear head
Step 1: Pick a geographical region, i.e. San Francisco, Peninsula, South Bay, etc.
Step 2: Make a post asking if reefers in that areas would be willing to show off their tanks, 3 is a bare minimum, although if there isn't a lot of driving 4 should be the minimum.
Step 3: Nail down a date, and confirm with those willing to show off tanks that it's ok.
Step 4: Start an announcement asking who wants to come, put a limit on the number so you don't overwhelm the places of those willing to show off, and get a pot-luck list started if you plan on doing lunch/food at someone's house.
All of the above can be done through the forum with minimal effort really
Step 5: Get on Google maps and plan a route with time frame, and send that message out to those who are going to come with the addresses.
That's it really, it's up to the people who want to come to figure out ride sharing, or whatever if they so desire. Biggest issue is if one of the tank showers bails out for whatever reason at the last minute, then you simply work around that and reschedule. Maybe tie in a LFS visit if there's one nearby, but that's really optional.