What could be better than sipping a refreshing bevvy, shopping, and listening to live music on a beautiful summer day, overlooking the water? The Boathouse by Mercer Oaks Catering via Facebook The Boathouse by Mercer Oaks Catering via FacebookHappy Hour at the Boathouse at Mercer Lake are Thursday nights during the summerThe Boathouse is in Mercer County Park and hosts so many fun events throughout the year. READ MORE: Live band schedule for Mercer County Park Boathouse Happy Hourrez-art rez-artSip, Shop & Enjoy Live Music August 9 at the Mercer County Park boathouseBack to shopping. On Sunday, August 9th, get ready to sip, shop, and enjoy live music at the Boathouse. Free admission for Sip, Shop & Enjoy Live Music on August 9th from 12 PM - 5 PM, at the Boathouse by Mercer Oaks Catering, inside Mercer County Park, in West Windsor, NJ.