When creating your ticket, you can do this through the “Availability” dropdown menu. If you’ve created the ticket already and now want to change the availability dates, no problem! Head back to the Tickets tab on your page's toolbar. Locate the ticket for which you’d like to change the days of sale, and click into it. 

From here, choose the “Limited Availability” option and then specify your dates.

Note: If your ticket is set as Deleted, you can bring it back into circulation by choosing On Sale or Limited Availability from the drop-down menu.