RV Formation Over Chiefs/Ravens Game
You're correct-the 17-ship flight was part of Breast Cancer Awareness events for the area, so the planes had pink smoke on their wingtips for a National Anthem pass.
KC Flight was joined by others from the West Coast Ravens, Falcon Flight, The Hawks, and the Cincy River Rats to form an giant Arrowhead (as in Arrowhead Stadium).
The combined flight also presented a check later at the stadium.
Details (including photos of the wingtip smoke mounts) are on several Facebook pages:
KC Flight,
CheckSix Photography (a photo series),
Robin Czerwonka's photos (including a passenger's view of the smoke and the check presentation).
Best,
Mike