Hi there, Terry, and thanks for bringing your question to 
planDisney!
I’d love to help you plan the second day of your trip to the 
Happiest Place on Earth! First, I’m so excited for you to attend the 
Disneyland After Dark: Grad Nite Reunion next month – it’s going to be a party for the decades!
I took a look at 
theme park ticket reservation availability for June 24 for Disneyland Park, and it looks like there is currently availability that day! As for where to stay, I took a look at availability at the 
Disneyland Resort Hotels, and unfortunately, I’m not currently seeing availability at any of those three hotels during your timing. However, I recommend taking a look at the 
Good Neighbor Hotels instead. These are Disney-approved hotels that are still located near the Disneyland Resort. I searched the Good Neighbor Hotels and found availability at several, though the pricing is on the higher side. If you’re willing to stay a bit farther from the Disneyland Resort, you could probably expand your hotel search a bit and find more availability at lower prices. 
I hope this information helps, Terry! Wishing you good luck in finding the perfect spot to stay during your Disneyland Resort getaway! 
See ya’ real soon,
Kristin