BookExpo America (commonly referred to within the book publishing industry as BEA) is the largest annual book trade fair in the United States. BEA is almost always held in a major city over four days in late May and/or early June. Nearly all significant book publishers in the United States, and many from abroad, have booths and exhibits at BEA, and use the fair as an opportunity to showcase upcoming titles, sell current books, socialize with colleagues from other publishing houses, and sell and buy subsidiary rights and international rights. Authors, librarians, and buyers for book retailers also attend the event.