You can find your Event Grids by clicking on Event Grids at the top of any page:

On the Event Grids page, you can choose to view current grids, or older, Archived grids:

You can filter current grids by Shared and Not shared with accounts. Grids are placed in Archived when the grid administrators for your publisher choose to Archive them. To view older requests from your accounts, you’ll just need to click into Archived.

Enter a grid by clicking on its name.