Join the Smithsonian Chamber Players in an open rehearsal of two about-to-be-recorded works: Antonin Dvorák’s delightful Bagatelles, Op. 47 for two violins, cello, and harmonium, and Artistic Director Kenneth Slowik’s new reconstruction of the now-lost original nonet version of the bucolic Serenade in D Major, Op. 11 by Johannes Brahms.