Date field on the Section Rate Card which automatically switches the section rate card to "sellable". This allows the admin to schedule the opening of premium spaces systematically versus having to set reminders and manually open rate cards based on date criteria.
Currently we have somewhat of a 'drip' based on Section Rate Card type when the on-sale takes place which we're managing manually based on specific date targets:
Announcement: Event made visible in the Visualizer and Lease Add-On rental rate cards become sellable
General Public On-Sale: Standard Single Night rental rate cards become sellable