Clauses are always a tricky aspect of grammar for students to learn so why not make it more exciting for them. Oftentimes, we use clauses naturally in speaking, especially when we are thanking people. Ex: "I would like to thank my mother, who has always been there for me." Boom! There's your adjective clause.
This idea was inspired by the 2014 Oscars, but my students loved this activity so much that I encourage you to try it out. Make it as real life as you'd like. The kids will get really into the roles if you let them.