Congrats to those who have gotten interviews! Those that haven't heard yet, please try not to drive yourself insane. Like SOV said, they interview about 20 people a week so invites go out constantly. Spots also open up as other people get into other schools.
Also, I talked to my housemates, and we'd all be willing to house people for interviews if you don't want to pay for a hotel. We have two sofa beds and are about a 15-20 minute walk from campus. You would just have to be okay with 3 dogs and a rabbit that stays in the living room (if you choose the downstairs sofa bed).
Also, if you can, try to stay for the Friday evening afterwards. We have happy hours every Friday from 5-7 in the Student Lounge and it's a great way to meet people and ask questions you might have wanted to ask but didn't get around too (and without any pressure).