DOWNTOWN DELIGHTS The River to River Festival offers more than 500 free events in Lower Manhattan. Friday, a performance by Audra McDonald pays tribute to the “Swedish nightingale,” Jenny Lind. Friday, 5 p.m. tickets distributed, Castle Clinton, Battery Place at Hudson River, 212-835-2789, free. Please see www.rivertorivernyc.com for a full schedule.

CHORUS GIRLS (AND BOYS) The Brooklyn Conservatory of Music Children’s Chorus holds its annual concert. Children’s choruses from the conservatory and from P.S. 34 and P.S. 154 perform songs including “Oh! Susanna,” “Take Me Out to the Ball Game,” and “Getting To Know You.” Sunday, June 5, 3 p.m., Old First Reformed Church, Seventh Avenue and Carroll Street, Park Slope, Brooklyn, 718-622-3300, free.

MARAH AND FAN Writer and pop-music aficionado Nick Hornby gushed about the Philadelphia indie rock band Marah in an op-ed piece for the New York Times last year. Before a concert by the band this weekend, he’ll read from a collection of unpublished essays about various bands, and then Marah will cover songs by those artists. They’ll follow with a full set of their own bluesy tunes. Sunday, 8 p.m. doors open, Bowery Ballroom, 6 Delancey St. at Bowery, 212-533-2111, $20. Note: Ages 21 and over.

To submit an event for consideration for the Calendar, please wire the particulars to calendar@nysun.com, placing the date of the event in the subject line.