Will the Monday or Tuesday off days be used for any of the first three nights rain dates if necessary ? I know the "R" word is nothing anyone likes to think or talk about.

They have not in the past. For instance Lasrenceburg rained out last year on Sunday and the show was just cancelled.

Logistically it doesn't make sense to make up Friday or Saturday if weather were to be a factor because of the location of the tracks.

Lawrenceburg didn't probably because they couldn't get many of its staff back for Monday or Tues as that plan wasn't in place before hand. IDK for sure.
But they have made up races on Mon and Tues before, Not talking about Burg here but a couple of tracks have done it. I think both Kokomo and LPS have. and financially its pretty sound as about a thousand are following the entire sprintweek, Camping or Moteling anyway.

Kokomo and LPS both did it as the finale but it was a matter of the staff being able to work the track. Can't comment on Lawrenceburg. USAC has always tried to make them up and work with the tracks and drivers to see what can be done.

Kokomo did a make up on a Monday