Hi Ian, I have done the workshop rotation model with our whole congregation.  Not everyone came, but everyone was invited.  I had to pick a target age group to gear toward so went with second grade and had activities for Youngers as an adaptation.  So many adults learn from what the kids are learning that that part worked well.  We did this in a whole group setting, so I had one workshop a week for the month of the Bible story.  The challenge was that I didn't know how many people would participate each week, so we tried to pick and choose workshops that had "everyday" supplies, but we also did let that stop us from getting supplies needed for special project.  

I think something like this would be a good Wednesday evening model.  We did this on Sunday mornings and since the culture in our congregation is having age based classes, multigenerational classes were very new.  We were trying this as people were starting to come back to in person church and most of the adults just wanted to socialize with each other, parents, too, so I don't think our timing was great, but the adults that did come really appreciated it.  

What was super successful was doing intergenerational service projects on site.  People could do an act of service and socialize at the same time and all ages were able to participate.  

I'd love to hear more about what you do!

~ Beth