Conversation so far:
Where was Kevin Clash born?
Kevin Clash was born in Baltimore, Maryland.
Who were Kevin Clash's parents?
Kevin Clash was born the third of four children born to George Clash, a flash welder and handyman, and Gladys Clash, who ran a small daycare center.
Where did Kevin Clash go to school?
While still in high school, Kevin Clash performed at venues throughout Baltimore, including schools, churches, fundraisers, and community events.
What type of performances did Kevin Clash do in high school?
While appearing at a neighborhood festival, Kevin Clash was discovered by Stu Kerr, who became Clash's first mentor and hired him to perform in the children's show Caboose.

Question: What year did that begin?
Self-contained rewrite: What year did Kevin Clash begin performing in the children's show Caboose?