Mabon also takes place during the harvest and as such, is a time for celebration. Have you considered building a special altar for Mabon this year? Something to bring home the changing seasons? If you are lucky enough to live in a rural area or to have a big and well planted backyard, you can probably find enough variety to make a pretty altar very easily. If not, make it a point to stop at a park a couple of time over the next week (Mabon is the 22nd) and do a little scavenger hunting.
You could start your altar with a couple of candles and add a fall leaf or two, an acorn or pinecone, a feather, a bit of a stone, some dried flowers, a stalk of grass or other grain gone to seed. If a shopping trip is in order, some small gourds are nice. Ribbons in colors to express a specific intent are always a good addition to an altar.
My permanent small alter is a smoked glass plate with a small patchouli candle for the God and a small pear scented candle for the Goddess and a small talisman or two. I add other things as the season or my mood dictates. I plan to add a red maple leaf, a pinecone, a nice feather if I can find one and some dried wild flowers.
I am going to have a ritual involving the Elements and the seasons ready for you on Mabon.