I agree with Sagesk:
Mabon is thanks and blessings -- and because of that, it seems like a good time to give to those less fortunate than ourselves. If you find yourself blessed with abundance at Mabon, why not give to those who aren't? Invite friends over for a feast, but ask each of them to bring a canned food, dry goods, or other non-perishable items? Donate the collected bounty to a local food bank or homeless shelter.
I did see this on a website and thought it was a great idea that I will be doing.