Ultimate Tango School of Dance in Medford presents its 31st Virtual Tuesday program of the pandemic. Virtual Short Sequences is offered at 7:30 p.m., entering the world of volcaditas. Learn to introduce the technique to your dance in a short first sequence, gaining understanding to draw on over the next few weeks of the course. Virtual Solo Exercises follows at 8:30 p.m. Classy Heels is available as a prerecorded YouTube video for a solo workout at home. There is no…