Summer fun overflows once again this weekend, starting with the trio of WaunaFest, Atwood Summerfest, and Opera in the Park. The calendar also includes: Art Lives Here and openings at the Chazen and MMoCA; a Lincoln Bicentennial Celebration; Old Times at APT; a Mad Rollin' Dolls bout; a MAMAs showcase; more live music by Dwiki Dharmawan, Corey Smith, dumate, Retribution Gospel Choir, Monte Montgomery, The Riverdales, Birdlips, and The Kominas; book readings by Maryann Lesert and Woody Tasch;