In the interest of helping you keep your workspace clean and tidy, you can choose to Archive the grids you’ve finished.
On the Event Grids page, just click the “filing cabinet” icon on the far right to send that grid to the Archived folder:
You can archive grids once you’ve finished with them, submitted your requests, etc. and you can archive grids in which you’re simply not interested. Doing so will keep your Open grids lists nice and clean and easy to use.