To share your laptop screen with a room full of people, you basically have three options: 1) hook your laptop up to a TV or projector using an HDMI, VGA, DVI, or Thunderbolt cable and/or adapter, 2) ask everyone in the room to awkwardly huddle around you, or 3) share your screen wirelessly.
https://www.goubiq.com/wireless-screen-sharing/
