The main venue, where all talks will take place, is room R-M110 in UQAM's Pavillon des Sciences de Gestion (abbreviated Pavillon R in signage and maps). The poster session will be held in room A-3316, in the Linguistics Department, located in the Pavillon Hubert-Aquin (abbreviated Pavillon A in signage and maps).
Here is a document with detailed directions to the rooms.
Le lieu principal, où toutes les conférences auront lieu, est la salle R-M110 dans le Pavillon des Sciences de Gestion (abrégé Pavillon R sur les panneux et cartes). La session d’affiches se tiendra dans la salle A-3316, au Département de linguistique, situé dans le Pavillon Hubert-Aquin (abrégé Pavillon A sur les panneaux et cartes).
Here are some food options in the immedate area; plenty more options along St Denis and Ste Catherine streets:
soupesoup: soups and sandwiches
Alma café: Salads and panini
Omnivore: Middle-Eastern wraps and mezze
Resto Cali: casual Vietnamese
Allô Daisy and Itaewon: Korean
Café Léo: pastries, quiches, third-wave coffee
UQAM's main campus is served directly by the Berri-UQAM metro station, which is a major intersection point for the city's subway network; any green or orange line train will take you there. For directions to the rooms of the workshop, see the document linked above.
To use Montréal's subways and busses, you'll need either a paper ticket (purchaseable at any station) or a rechargeable OPUS card (purchaseable at stations and most convenience stores). OPUS cards can be easily recharged on your phone.