Fresh Air Experience in Ottawa called the Guinness World Records and asked if there was a record for the most rollerskiers in one place. There wasn't. So they called all rollerskiers to Gatineau Park in Chelsea, Canada on Saturday, October 2.
Here's a video (by xczonetv) and photo (by MuicianOnSkis.ca) showing the event.
How many skiers? 257 rollerskiers, all shown in the photo below the video.
Photo by MusicianOnSkis.ca: