Summer on the Hudson, a program of the New York City Department of Parks and Recreation, presents its 15th annual Mamapalooza Outdoor Extravaganza. On International Day of Families, you can rock hard and thrive, with music, family-focused business, wellness activities, and art activism to inspire all to find their voice and convey peace and equality. Performers include Jeanette Berry and the Soul Nerds, which draws on R&B, soul, jazz, reggae, blues, funk, and neo-soul to tells stories that bridge over genres to the heart of all things — love; Miranda Writes, a hip-hop a crusader for positivity; j and the 9s, a hard-hitting, costumed flute rock experience from Brooklyn that breed together rock-and-roll riffs, the raw sound of punk, and an entertaining interactive stage show; and Cecilia Villar Eljuri, whose music is a mirror on this generation’s global fusion reflecting her Spanish and Lebanese heritage, the rhythms of her homeland, Ecuador, and the punk and rock and roll from the melting pot of her New York youth. Riverside Park South at W. 70th St. May 15, noon-5 p.m. This event is free, with food on sale, and seating is on a first-come, first-serve basis. More information here.