Here's what was found at Saturday's parade:
450.1625 [ CSQ] TV IFB/Cues
451.1875 [ ] Organizers (DMR - Color Code 1, Group 10) (S)
461.3875 [ d152] CSC Event Staff (S)
DC Fire used talkgroup 717 (Special Events 2).
The 450 MHz frequency may have been used by a crew from outside the area. There appeared to be a TV crew from Philadelphia at the parade. The organizers had portable radios with what appeared to be at least a dozen channels, but only one was found. Blanchard Communications licenses the frequency in DC, but it's unknown if they were the radio provider.