If you are engaged as a combative sports promoter in Minnesota you are required under Sections 341.21 of the Minnesota Statutes to file a Minnesota Promoters License Bond  as a condition of licensure.
Bonds Express offers a Minnesota Promoters License Bond with a 99% approval rate.

A surety bond protects the party requesting the bond, the Obligee, against any financial losses as a result of poor financial decisions, damages, unethical decisions, or a failure to follow state and local laws on the part of you, the Principal. The Minnesota Promoters License Bond holds you accountable for your business decisions.

By possessing a Minnesota Promoters License Bond, you are telling your Obligee that you can be trusted as a Principal and that you stand behind your business decisions.