It’s a rather unassuming site for an Abbey Road -style photo activation. To the random observer, no good reason announces itself to explain why tourists from all over Canada and the U.S. would flock to the red-brick facade on Toronto’s bustling Queen Street to take ecstatic selfies beneath an oval sign that reads “Rivoli” in a scribbly font. The tourists keep showing up anyway. [Photo: PaulMcKinnon/Getty Images] While the combination restaurant/ pool hall/concert venue has hosted performers like Robin Williams, Amy Winehouse, and Adele over its 45-year history, the Rivoli has only lately become a tourist mecca, thanks to a fictional music act relatively few people have heard of—even if it shares a name with one of the most revered bands of all time. Nirvanna the Band the Show —note the legally significant extra “n”—is the unhinged, long-running comedy project of BlackBerry filmmaker Matt Johnson and musician Jay McCarrol.…