I'd break it to him now--if he is looking forward to some beer, and when they plop down that Bud Lite--that could even overcome a Disney moment.
Do try what I do--get there a little early, go to Crocketts, and he can at least get a Corona, or Sam Adams. Go out on the verandah, grab a rocking chair and wait for show time. Inside, he'll at least had the small satisfaction of having something other than Bud Lite.