Ah, thanks for the note Paul. That would be the reservations for campsites in the Whitney Portal campground. May 28 is Saturday of the Memorial Holiday weekend, so I see people can reserve sites today.
Also note when looking for sites, this alert showed up:
ROAD CONSTRUCTION: The Whitney Portal Road is being reconstructed in 2016. Daily extended closures and limited parking will require careful planning. Whitney Portal Campground guests must park within designated campground site only. There will be no curbside parking on Whitney Portal Road during construction at the Whitney Portal area. A parking permit is required for hiker parking.
The road construction is going to be quite a topic next summer.
