Ultimate Tango School of Dance in Medford presents its first weekly Virtual Tuesday program of the new year. Virtual Short Sequences is offered at 7:30 p.m., featuring the first of four sessions on the Mystery of 4th Sacada. Learn how to improvise with sacadas by understanding possible 64-plus sacada variations. The cost for Virtual Short Sequences is $20 per session; register here: https://courses.ultimatetango.com/pages/short-sequences Virtual Solo Exercises, which caters to dancers with no partner, is presented at 8:30 p.m. There is…