We are planning to setup a Discord role specifically for on-site attendees. This will allow us to ping people on-site without having to ping the entire server.
If you choose to share your Discord username, please copy-and-paste from Discord to make sure any special characters and unique ID numbers are included. On desktop or browser, click your username in the lower-left, then click it again in the pop-up window to copy it to your clipboard. On mobile, open the settings screen and tap your username to copy it to the clipboard.