I did go out with colleagues sometimes earlier for lunch or dinner but we'd have a large table to ourselves with 12+ people so it might have been hard to pick us out.
I stopped clubbing much by the 30s (and also got married) but I also hung out a lot around areas filled with nightclubs and bars... including for dinner. And that's usually where I found lots of people my age in the mid-late 20s, including the restaurants near areas filled with bars and clubs and at night time (like 8 pm or after, more often like 9 or 10 pm). Lots of people around that age might grab a late dinner next to one of their favorite bars or clubs by themselves or with friends, then go clubbing or bar hopping.
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