I got an answer on the $100 Celebration Dinner credit for Caesars Rewards Diamond. Per Nick at FM, you don't need to stay at a Caesars property to use the credit. He was at Delano when he used his. Yay!
I looked at Amex FHR too, and decided I'd rather have a $100 F&B credit that Chase LHR gives than a $100 spa credit for the weekend, plus being able to pay at the hotel rather than prepay with Amex would work better for me. I'm trying to decide if I want to avoid the resort fees by staying at a Caesars property (due to match to CR Diamond) or pay the $44.22/nt resort fee at Bellagio. I kind of feel like living it up at the Bellagio being that this is the only kid-free weekend in 14 years!
The weekend I booked was expensive too (compared to surrounding weeks), but the only one that would work for our schedule, so I feel your
. I think my trip is before yours, so I can let you know if it all goes according to plan for me.