I'm sure there are many local SP's who would be very happy to fulfill your request. Depending on the location of the party and the availability of a private room, alot of the ladies will do these kind of events and then "entertain" any gentlemen who are looking for a little more.

My suggestion would be to go onto Escorts Canada and peruse the Winnipeg section. Pick out the ones you think would appeal to you and your friends. Remember to not only look at their pics but read their profile. You don't want someone who may be good looking but has the personality of a potted plant for such an engagement.
Then 1) Contact them and find out if they would be capable and what they would charge. Alot would likely charge their outcall rate but I do know some ladies have a "social event" rate. 2)Come back here and do a search for reviews or ask for guys opinions.
Don't be suprised if she wants to know your real name and asks for ID or if she charges extra to bring security. A 1/2 naked lady in a room with a bunch of drunken, horney guys has to be carefull.
PS: Whatever you do, do not call Superb Entertainment. They supply alot of the strippers in town. It'll cost you way too much and they often send someone other than promised. We did a hockey party twice in the past with them many years ago (before I started in this hobby) and on both occasions they replaced the hot stripper we had paid for with some less than attractive newbie.