This page should not be repurposed or deleted. You can change the name of the page, and it can be moved to somewhere else in your navigation or hidden from navigation if you don't want it to be seen (go to Manage Site > Edit Navigation > select page "Properties," then check "Hide From Navigation"). 

This content is in your "Signup Calendar” Template and can be easily edited or deleted as you create your own content: go to Manage Site > Edit Template Content and click on the pencil icon in the upper right corner of this Text Area.The “Signup Calendar” Template uses the Full Width Layout (there is no right sidebar) and has only been applied to this page. If you’d like to change the Template that’s assigned to this page, see our Help Center article on the topic here. We recommend a Full Width Layout template for this page.

You may rename or move this page, but you may not delete it:  go to Manage Site > Edit Navigation. For more information, see our Help Center article here.