In general, Team for your organization can be added by any Admin in the User management part of Azavista platform. However, if you want to change who works on one particular event, you can set it up in the Settings tab of your main Event page, under the section Teams. There you have all teams with access to this event listed.
You add more teams by clicking the Plus button. That will open a popup where you can search for and select one or more teams from your organization that you want to assign to a specific event.
You can remove one or more teams from your event by selecting them in the list, clicking on the three dots in the Actions columns and selecting the option Unassign.