Do you remember the twenty-first night of September? If you do, you’ll want to mark your calendar for December 15 and 16, when Earth, Wind, & Fire bring two nights of disco to New York’s Beacon Theatre. Onward into their 70s, the members of the beloved band continue to age in style. “Now December / Found a love we shared in September / Only blue talk and love, remember / True love we share today.” —Carolina de Armas