The Friends of the Mercer Carnegie Library will hold their annual Rhubarb Fest Book Sale on Friday, June 1 from 9 am to 4 pm and on Saturday, June 2 from 9 am to 2 pm. Proceeds benefit the Library. The Library will host a Friends only Book Sale Preview Party on Thursday, May 31 from 4:30 - 6:30. The $12 annual, tax-deductable Friends membership can be purchased at the door of the party. Refreshments will be provided.