No data for airshows?

RFD has an airshow this weekend. Most of the day I was watching the Blue Angels practice (much better show when I lived on Pensacola Beach outside of PNAS)…But, tons of craft coming in - none show up as arrived, on their way, hanging out or anything…while I am certain that this is normal - why?

Military aircraft are blocked and do not show up.
Most other air show participants mostly come and go VFR, it seems to be their preference.

Beg to differ slightly… some broadcast ADS-B. Local ANG base here flies the ski equipped C-130’s that service the South Pole. SKIER87 is the usual call sign my piaware picks up occasionally when they’re shooting approaches at KSDY or KALB…