@SydRy Thanks for reaching out!
REI works with Rainy Pass Repair for tent repair needs. You can find their contact information on our REI Repair Services site. We just had a good conversation start about tent repair, feel free to check out the information at Repair Advice for an REI Half Dome 2 Plus Tent.
Hope this helps, if you still have questions after checking those two links out let us know. Thanks!