It turns out I was spot-on, and this parade caused me to do all kinds of extra driving and clever navigating only a local could accomplish.
Once past the parade, I thought I was free to speed on up the coast, roughly ten miles to the other place in which I work. In this case, I was dead wrong. The city directly to the north was having a parade of its own, meaning that I was left to struggle through detours for more than an hour.
So, after leaving the home base around 11:45am, I didn't reach the other location - just ten miles up the road - until 1:10pm. Couple that with the fact that it was 28C (86F) outside, tourists rarely know how to drive, and the truck I was using lacked air conditioning; and I was made to be in a perfectly dreadful mood as a result of these tedious parades.
In future, you may go march your local celebrities, dressed-up marines, and driving advertisements elsewhere. Thanks very much.