Today is National Dance Day, and to celebrate, Playhouse Square will host a special performance by Hubbard Street Dance Chicago. Now in its 40th year, the dance troupe regularly presents "bold new works that continually push the art of dance forward." The troupe has appeared in celebrated dance venues across 44 states and 19 countries. Seating for this performance will be on the Connor Palace floor level only. The performance begins at 7 p.m., and tickets are $25 to $55. (Niesel)