Quilting bee - Tradução em português

Howdy folks =P

I saw it on Robot Chicken (A TV series).

In this episode, there's a sketch where two lego toy-man go to a Playmobil mansion (a parody to the Playboy Mansion) and there they meet Hugh Hefner with his 3 girlfriends. Hugh Hefner begins to talk about his schedule for the week and then they come to the following phrase:

Sunday afternoons are when we do our quilting bee.

Question is, what does Quilting Bee means?

I searched through Wikipedia but I still don't get it.

Thanks for the help and sorry for the poor Engllish.