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The show, which is about 15 minutes long, runs on a loop from about 5:00pm until 11:00pm, and we got there just in time to catch the show as it began from the beginning. Essentially, the Lights Show is a projection of a Christmas/winter themed short movie, onto the exterior of the Peace Tower and Parliament buildings. There is even perfectly synced music that accompanies the show, which I particularly liked!
We brought Rocky with us, and walked around the grounds a bit after the show was over. I don't think he cared much about the Lights Show, but he was a pretty happy doggy to be outside and walking around, instead of cooped up inside and alone!
In any case, if you live in the Ottawa region, I strongly recommend going to check out the Christmas Lights Show!