This looks like a nice concert although I'm unfamiliar with the Willard House Museum. I'm awaiting a call back on the ticket price.
Music in the Barn: Blackstone Cuil and special guests - Spend a mid-summer's night enjoying the spirited melodies of this lively Celtic Band. Musicians from Grafton's Apple Tree Arts open this musical evening. For more information, contact the museum at[masked]-3500. Check out the band's website describing their sound as "irish mod & more" which includes two songs: www.blackstonecuil.com
This group plays regularly at the Fiddler's Green in Worcester.