The caesar's benefits page lists a separate celebration dinner benefit under the "Online Sports Betting" section (NOT to be claimed/earned in nevada though, but for all the other states).
https://www.caesars.com/myrewards/benefits-overview

Anyone have experience with *that* one? It appears to be in addition to the other one.

"ONLINE SPORTS BENEFITSChoice of a $100 Celebration Dinner at a Caesars Rewards destination, or $50 with Uber Eats to use anywhere17. (Caesars Sportsbook & Casino App. Available in AZ, CO, IA, IL, IN, KS, LA, MA, MD, MI, NJ, NY, OH, ON, PA, TN, VA, Washington DC, WV, WY)"