On Saturday, April 30, Independent Bookstore Day will once again be taking over local bookshops. To celebrate, bookstores will be hosting a grab-bag of literary festivities. Diesel Bookstore (5433 College Ave.) will release Record Store Day-style, limited-edition products. Among the rare literary goods will be X is For…, a new record featuring Carolyn Pennypacker-Riggs made as an accompaniment to local author Kate Schatz’s best-selling children’s book Rad American Women A-Z. Meanwhile, Schatz will appear in person at Books Inc. Alameda (1344 Park St.) to promote the record. And at Books Inc. Berkeley (1491 Shattuck Ave.), there will be a photo booth, with costumes for dressing up as your favorite literary character (think Harry Potter robes). Pegasus Books Downtown (2349 Shattuck Ave., Berkeley) will take part as well, offering an ask-me-anything session with author Mary Roach, who is currently working on a new book, titled Grunt: The Curious Science of Humans at War.