Not that one but I got a similar event (pre post game) with olivia at the Konikoni restaurant with the local special or whatever it's called.
I wonder how many more of these events there. I've got enough to money to buy every meal at every restaurant so I'll have to go around to all of them and see what (if anything) happens. Serebii should add a restaurant category since there are clearly at least a few events at them.
I think I've found a new way to obtain Hidden Abilities (forgive me if someone else found it first, this thread is reaaaaaally long). Anyways, I was breeding some Eevee's to complete my dex, using a Female Umbreon (Synchronize) and a Tauros (Intimidate). I got 6 Eggs, which I put in Isle Avue in Pelago. I'm not sure how long they were in there, but at least 24 hours. When I took them out and hatched them (which took very little time, probably a hundred steps or less), all hatched with their Hidden Ability, Adaptability.
What is odd is I had a few other eggs in there as well. A Snubbul, Goomy and Shellos. None of them got their respective Hidden Abilities. But they weren't in for over 24 hours like the Eevee eegs were. This is something we'd need to do some testing on. Anyone else notice this?
Adaptability isn't actually their hidden ability. Eevee has 2 abilities. It's hidden ability is actually anticipation.
Cool theory though!