Many theater companies are run and operated by enthusiasts, donors or sponsors. Whenever you have a particular membership that offers free tickets as perks for joining/donating, then this feature will assist in offering it to your members.
On the backend you can create plans that will be available as payment options for your member to register and pay for such. You can create as many member plans and add free seats. When a member successfully paid for membership, they will be receiving a confirmation with their Member ID which is automatically generated. With this ID number member can redeem seats during checkout.
Use shortcode [rowseats-membership-form] to bring up the form. You can test it by following this link http://rowseatsplugin.com/rowtest/membership-form/