Discord screenshots 10

The Roles pane in the server settings, with the Committee role highlighted.

You need to set up a Committee role for your convention committee, so head back to Server Settings (see screenshot 5) and this time go to Roles in the sidebar. Then, click the circled plus sign and create a role named Committee. Choose your favourite colour, and then give that role the permissions you want it to have (I tend to literally toggle everything on here).