Built a compilation of local happy hours, lunch specials, and other cheap eats at https://fullprice.no (as in, "do you want to pay full price? No."). The idea isn't all that original but I thought my layout and presentation was rather unique, for example the 24-hour slider as opposed to a clock interface.
I thought it would be easier post-launch to get restaurants to participate and add their own information (nearly-free marketing), but that was a faulty assumption. The admin interface is also pretty cool, very simple to specify blocks of time when the specials are active.
Unfortunately it hasn't been updated in 4 or 5 years. When Covid first started, I launched a sister site just to list restaurants that were open, I took that down about 6 months ago.