I agree. This is strange but maybe he is a nice guy who has friends there and combine a date with a trip. Since he is connected with people there he has an extra incentive to meet up. It's not like he is staying in a hotel and will fall flat on his face if it doesn't work out. He always has the visit with friends. Or he may want sex (although that's an awful long way for sex. Or to assume that he will get you to leave your boyfriend.
I think he may be interested in you sexually but he can see his friends and have a date with you. That doesn't mean he expects you to have sex on that occasion but I agree that that is too far to be just friends. See where the date goes and if he does try to convince you to more than friends then you can decide at the time. If you truly are uncomfortable you have the choice to not go because you are not interested in a dating situation. Make sure he understands the conditions that you will meet under