Part 107 pilot reported flying over persons with a UAS that was not in the correct size category for the type of operation. UAS pilot learned during the post flight of their error.

Narrative

Had a last minute hire to film a parade by the committee who put the parade together. Because there was no time to seek a waiver; I went over the new regulations for flying over people and believed I was Category 2 compliant. At the event I made sure to be careful and keep my drone mostly over either buildings or vehicles and not people; and maintained direct line of site the entire flight time. There were a few times were I had to transit over people; but due to the new regulations I believed I was within regulation as I wasn't maintaining sustained flight directly over people. After I was done I landed the drone and a Public Official approached me claiming I was not in regulation that I would need waivers from every single person there to fly my drone around the crowds. While I had my own doubts to his claim; I reached out to someone for help understanding the regulations. Even though I was correct that the Public Official was not correct about needing multiple waivers; I was informed that I was not within regulations and was explained what I misunderstood about the Operations Over People regulations. I now have a better understanding of the regulations; and will apply it to future flights.