Matt Fulton is not used to “rocking out” alone on his sunporch. The MIT facilities and operations administrator usually sings and plays guitar before a full room at Boston’s Green Dragon on Thursday nights. At least, he did until bars closed and physical distancing increased in response to Covid-19. Recently he found himself playing for a new audience, his Plasma Science and Fusion Center (PSFC) colleagues, welcoming them to an end-of-the-week Zoom concert of “pub tunes” with Elton John’s “Your Song.” The virtual get-together was inspired by a conversation Fulton…