Allen and Karen Kaeja, the husband-and-wife co-founders and artistic directors of Toronto’s Kaeja d’Dance, return to live, in-person performance with a double bill that celebrates their company’s 30th anniversary except, because of a one-year pandemic delay, their new show flies the numerically more precise banner “31.” As choreographers, the Kaejas have always had distinctly individual approaches. Karen Kaeja — the couple invented a new family name when they married in 1989 — describes this as “a saving grace” in their long, tight-knit personal and professional relationship. In the case of their latest show, to which each contributes a new group...