Calgary Rakushinkan is not offering instruction for kids at the moment.
Note that the City of Calgary does offer courses in karate and other martial arts at several locations throughout the city. http://recguide.cocnmp.com/#/Search/7/1
Other options for kids martial arts:
Tanren Juku - offers several kids/youth clases in Aikido for kids (and adults)
Sabean Karate - offers instruction in Chito Ryu karate in Varsity - classes for kids and mixed kids/adults
Aiki Jiu Jitsu - offers instruction for children in Aikido and Brazilian Jiu Jitsu in the NW