Due to economic disputes, our company transferred 20,000 yuan to the exhibition company without a contract, but the exhibition company didn't get us a booth. Where can we file a lawsuit?

The absence of a contract does not affect your company's prosecution. It's a contract dispute, and it's just an oral contract. You can sue in the court where your company is located. According to Article 18 of the Interpretation of Civil Procedure, if the two parties have not agreed on the place of performance of the contract, the place where the monetary party accepts the contract shall be the place of performance, and the other party shall be required to cancel the contract and return the expenses involved and compensate the relevant losses. If your local court refuses to accept it, you can sue at the defendant's place.