Hi Katie,
Thanks for reaching out! While our Event Tickets Plus plugin does include QR code functionality for checking in attendees via a simple ticket scan, unfortunately, these QR codes can only be scanned one time per ticket. If you’d like to enable QR-based check-ins for multiple sessions, the only way to accomplish this for now would be to create separate events for each session and request that users register in advance for each session they’d like to attend.
I’m sorry to be the bearer of bad news here! Let us know if you should have any other questions about your intended setup and how it might work with our plugins–we can certainly do our best to assist. 🙂 Cheers, and thanks again!