Watch the four-ton elephant in the room disappear at Ringling Bros. and Barnum & Bailey Presents “Zing Zang Zoom.’’ And if that’s not enough, apprentice illusionists from the audience will mysteriously levitate their parents. Zingmaster Alex and his assistant, Levitytia, will try to ward off Mr. Gravity and his team of Heavies, who are total downers. Thrill acts include human cannonballs and the Qi Qi Har Acrobatic Troupe. Tomorrow at 7 p.m. (through Oct. 17; free Clown College All Access Pre-show for ticketholders one hour before shows). $13.50 tonight (excludes Circus Celebrity, Front Row, and VIP tickets), $16.50-$141.50. TD Garden, 100 Legends Way, Boston. 800-745-3000. www.ticketmaster.com