Idea for realisation?

Since you seem to be struggling to come up with an idea here, I wondered what you might think about turning a 'pub crawl' into a kind of guided event - something like an alternative public guided tour of pubs which looks at the different characteristics of different pubs. You could have a mixture of real/ sociological research and mythical or unverifiable information. It could be delivered (tongue in cheek) to people wanting to find out more about pub culture for their citizenship tests or as alternative London guide for new students. E.g the Jack the Ripper tour ends up in the pub that he's supposed to have drunk at in the east end. It could mix interesting facts with stories and made up stuff and could move between particular pubs - eg historically interesting pubs / pubs associated with different communities/ rough pubs etc. You could co-write a guided tour and film it. Lots of artists have used the 'alternative' guided tour as a structure for their work e.g Janet Cardiff’s Artangel audio walk, The Missing Voice: Case Study B (1999), guides visitors on a physical and psychological journey through the streets of Spitalfields. Just a thought but maybe it will get some ideas flowing.

Also the Situationists took seriously the value of 'psycho-geography' as a mechanism for disrupting the way that we merely consume the 'spectacle' and structures of the city. That could also be a fruitful route for developing the project's rationale in more depth.

To strengthen your rationale further, you could look at the Mass Observation project which was started in the post-war period and I mentioned in earlier lectures. Situating it like this could help cast the project in a longer trajectory, linking it to other (dis)similar projects which then help to justify and bolster the work you're doing here - by creating a kind of intellectual lineage for it.

Also do check out Google Scholar - there's a huge amount of material on the British pub there that you can use to tease out the rationale a bit more.