By having an SMS campaign for the bookstore, students can sign up for book buyback reminders via a signup form on the bookstore's website or by opting into an SMS keyword.
Create a keyword that students can text to get information about the book buyback program. When students text in this keyword they will be opted in for reminders and communications. Keep the keyword related to the bookstore.
Set up a signup form to collect contact details and consent from students that want to sign up through your website. They will be sent updates and reminders through the same campaign as the keyword opt-in students.
Set up a drip campaign of planned buyback dates. In the campaign, make sure reminders are sent prior to the event and during as well.