So, a ministry is something you would do on a regular basis, right?
It seems that a multi-cache would be something that make it hard to do on a continual basis.
For one thing, it would take a lot of planning and preperation to do this one a weekly or bi-weekly basis.
Secondly, If the people aren't into, you might not get a whole lot of people repeating their visits.
Last, if the idea is for a lot of folks to get together then seperating them into small groups for what might be 2 hours or more seems to be counterproductive.
That's just my thoughts.
But if you goes, well more power to ya. I'd do it.
P.S. Yeah, I wouldn't post on Geocaching.com