Ghoulish gatherings and sweet soireés

Boulder Symphony's Remix Curiosity Concert: Families are welcome to dress up in their favorite costumes and experience the symphony with Mozart, Professor Snoot and Conductor Devin Patrick Hughes. Kids will experience music from Tchaikovsky and Vivaldi to Metallica, Lil Nas X and Harry Potter; 3 p.m. Oct. 31; Grace Commons Church, 1820 15th St., Boulder.