A tap-dance concert featuring Nian Cadman-Dake, the Original Wildcat Jass Band, Tucson Tap Attack and several local dance academies takes place at 7 p.m., Saturday, May 21. $20; $15 advance. Ten master tap-dance classes are held from 9 a.m. to 6 p.m., Saturday and Sunday, May 21 and 22. $15 to $35 each class; $5 observer each class; $15 observer all day. An intensive course for youth ages 10 to 12 is held from 1 to 6 p.m., Saturday, May 21. $75; $15 to observe. Visit dancinc.biz/ntd to register for classes, to buy tickets or for more information.