Campfire42, here's the PA website link for your favorite WI campground. Looks like they'll do the PA rate for all nights except during special events.
http://passportamerica.com/campgroun...inescampground
And here's the "restrictions" section..
Open May 1st through October 31st. P.A. discount is not valid during special events. Please mention Passport America at the time of making a reservation. *Rate is for two adults with up to 4 children, $5.00 for each additional adult. Water/Electric Sites 30 amp: $25.00, P.A.: $12.50. Water/Electric sites 50 amp: $28, P.A.: $14. Premium Full Hookup Sites (water/sewer/electric 50 amp): $35.00, P.A.: $17.50