Saturday’s Chicano Park festivities in Barrio Logan got a surprise guest with a performance by singer Alicia Keys. Social media lit up with footage of Keys singing atop the roof of Arts-Rec, a neighborhood skate shop. Keys was joined by her husband, rapper/producer Kasseem Dean (a.k.a. Swizz Beatz). View this post on Instagram The couple’s appearance coincided with the opening of “Giants: Art from the Dean Collection of Swizz Beatz and Alicia Ke…