The Edge closed down in the summer of 1981, so the venue is wrong. To the best of my knowledge, the Cure didn't play Toronto in 1983 otherwise I would have gone. Seeing that they were in New York at the time, they may have done a surprise show in Toronto promoting Love Cats or something, but I cant confirm this.
... Capacity was maybe 150 people. The Cure played at the Concert Hall in 1981 which had a capacity of close to 2000, so wouldn't make sense they would play tiny venue 2 years later unless it was a surprise gig.