Produced by the Boston Playwrights Theater, this festival is held every spring at the Huntington Theater Company's Calderwood Pavillion. It is an all-day marathon of ten-minute plays selected from more than 400 entries from Boston playwrights. The 50 plays selected are staged by 50 New England theatre companies. It's net proceeds are donated to the Theater Community Benevolent Fund.
You can go to the website here.