Regatta Shoreline Amphitheater by admin | Aug 6, 2019 | community | 0 comments The Regatta Shoreline Amphitheater is Flathead Lakes’ premier concert venue. Located on the Polson Fairgrounds in beautiful Polson, MT. Check out the video. Regatta Shoreline Amphitheater in Polson, MT from David W. King Pictures, LLC on Vimeo. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.