All prices quoted here are in Canadian Dollars.
Address: 6230 Coburg Road. Reservations: 902-494-8840 or 1-855-DAL-STAY or www.dal.ca/book or email@example.com, using the group code "QPL2018" (for QPL) and "MATH2018" (for MFPS). We have reserved a block of single rooms at $44.50 plus tax per night. Larger suites are also available. Rate include internet, parking, and daily membership passes to the Dalplex fitness facility. Shared private gender-neutral washrooms. Reservations must be confirmed 30 days prior to arrival date. Website. Email. Distance to workshop: 450m (6 minutes walking).
Address: 1980 Robie Street (at Robie and Quinpool). Phone: 888-810-7288. QPL/MFPS attendees can benefit from the discounted rate of $139 per night (plus tax). Reservations can be made on the phone, via email, or on the Atlantica's website. If booking on the website, use the corporate code: "DAU". Website: www.atlanticahotelhalifax.com. Distance to workshop: 1.3km (16 minutes walking).
Address: 1266 Barrington Street. Phone 800-565-9346. Charming historic hotel, much smaller than the Atlantica and the Lord Nelson. Oscar Wilde stayed here once. Website: www.waverleyinn.com. Distance to workshop: 1.5km (18 minutes walking).
I have no personal experience with Halifax Bed & Breakfasts, but tripadvisor.com is usually a good source of information. The following are within walking distance of the workshop.
Address: 1263 South Park Street. Phone 877-414-8577 or 902-492-8577. A large B&B or perhaps a small hotel. Website: www.gardeninn.ns.ca. Reviews: tripadvisor.com. Rates (from website): $129-$179 (high season). Distance to workshop: 900m (11 minutes walking).
Address: 836 Robie Street. Phone 902-405-2424. Reviews: tripadvisor.com. Rates (estimate): $139-$199. Distance to workshop: 1.2km (15 minutes walking).
Address: 1839 Armview Terrace. Phone 888-303-5056. Website: www.thepebble.ca. Reviews: tripadvisor.com. Rates (from website): $265-$345 (high season). Distance to workshop: 2.2km (27 minutes walking).
Address: 1394 Edward Street. Phone 902-494-9500. Very close to the conference, but very mixed reviews on tripadvisor.com. Rates (from tripadvisor): $95-$125. Distance to workshop: 260m (3 minutes walking).
These days, when I go to a conference, I often use Airbnb.
Probably the cheapest option. This website lists three of them: Halifax Youth Hostels.