The University of New Hampshire InterOperability Laboratory's (UNH-IOL) Gfast Testing Services will be hosting Virtual Gfast Interoperability Plugfest, beginning April 19, 2021. Participants MUST register to participate, all Gfast equipment MUST be on-site at the UNH-IOL, and will be remotely controlled. No on-site attendance will be permitted. This event is an opportunity for vendors to test the interoperability of their Gfast chipset implementation(s). This event will be hosted in the UNH-IOL's facility in Durham, NH, USA, with participants connecting to the test beds virtual from around the world.