Washington Square Hotel:

Washington Square Hotel, 103 Waverly Place, Manhattan.

For details of the property, the rooms, and the services, see the hotel website below. It is 5 minutes walk from the conference venue. Rooms may still be available at their regular rate.
https://washingtonsquarehotel.com/

NYU Housing:

There are no further dorm rooms available to conference participants.

For those who already confirmed their bookings: The dorm is air-conditioned and within a 15 minute walk to campus. At 110 East 14th Street.

Click here for details of check-in, etc.

Hotels Nearby:

NYU also has a list of nearby hotels that may offer slightly discounted rates: https://www.nyu.edu/admissions/undergraduate-admissions/visit-nyu/hotels-discounts.html

But it might be easiest to simply use an online booking engine like Expedia or Hotels.com.