This article contains information on how to manage channel widgets.
The Channel widget area is a great place to add all the important documents, links, and calendar events to the discussion view.
How to do it
To add and remove widgets, expand the widget settings and toggle widgets on or off. To change their order, click on the space to the left of the widget header and drag. You can also reorder Channel links by dragging.
The Upcoming events widget shows events from your Channel Calendar.