At the free Chilmark Potluck Jam this weekend, music fans will have a chance to bid on a one of a kind piece of local music memorabilia and to support a good cause at the same time.

This Saturday, the 50th Chilmark Potluck Jam will brighten the windows at the Chilmark Community Center and spread its glow over a Martha’s Vineyard winter, as it has done for more than 10 years now.

Mandolins, masks, mashups and mashed potatoes greeted a horde of hungry listeners at the Chilmark potluck jam on Saturday night.