Insurance!?

Recently a school contacted me about calling a dance in their gym. After it was all set up I received this message: One last thing I forget to ask you to send us a copy of your certificate of Insurance naming Hitchcock for the March 26th dance. Most insurance companies just email it to us. This is the first such request I have received as caller hired by an institution. Any suggestions on how to handle this request? Is this becoming common? Is this an appropriate topic for this group? Thank you!