The LOR from my internship came in, so that leaves only the professor/advisor's LOR and the ever-lovely PS to gather before can finally submit! (I know you can submit as long as the 3 LOR writers are registered, but you can't request more LORs after submitting can you?)
For the backup LOR, I'm thinking that possibly I could be able to swing asking for one from my current academic advisor. If he is willing and able to, it will likely be a pretty generic one since I've only met with him for advising-related things throughout the past few years and don't know him on the level of the previous prof/advisor, but at least it would still fit the bill for an academic LOR, unlike the other backup I had in mind which would also probably be plain-ish anyway.
Everyone's excited for fall, pumpkin spice and Halloween and I'm honestly so excited for Christmas/winter already