There is a startup company, Sauce Pricing, that provides the technology to allow restaurants to implement "dynamic pricing". Their website:
https://www.saucepricing.com/
They list the customers that employ their technology, identify several use cases for that their technology can implement (e.g. unique prices for lunches, dinners, happy hours, holidays, etc.), have a video demo, and highlight some possible integrations into several industry aggregator and POS systems.
As someone who is any curious about "how is this implemented behind the scenes", I find it interesting
. I am not surprised, as "surge pricing" has already been in place for things like special days when many eat out (e.g. Mothers Day, St. Valentine's Day, St. Patrick's Day), and the technology now makes it possible to go beyond that in an efficient manner. Whether that's good or not will depend on where and when one chooses to eat
.