I read that CD was trying to sell around 40-50% of reserved seats. I don't think they've reduced ticket prices, and it appears they're selling infield access on Saturday. ($70-$80, depending on when you buy the ticket). Not sure what the state restrictions are, but while Keeneland indicated it was mandatory to wear a face mask, I saw plenty of patrons online who didn't comply.
Attendance on Friday may be an indication of what Saturday's crowd will be like - I'd expect a reduction of the normal Oaks (about 95K) and Derby (about 145K) to be less - but I don't know how much less. Weather forecast looks promising for those that don't like rain, snow or heat, though some rain in the forecast for the next couple of days.
Unless the horse you like has known issues with crowd noise, or has a tendency to act up in the paddock, it's a bit difficult to gauge the effect of the crowd. Thoroughbreds tend to be a bit high strung, which is one of the reasons it can be a big advantage to delay betting until the post parade.
Of course then you're at the mercy of the ADW tote systems staying up, or long lines if on track, and risk getting shut out....