I have rarely meet other programmers apart from the few ones at work, and usually we don't socialise outside of work. I think this is the norm. I haven't noticed any kind of scene. The average programmer is quite anonymous. You code, and then you go home. Maybe you go drinking with your flatmates, one of who might be a plumber and the other a teacher. They don't talk to you about about plumbing, and you don't talk to them about programming. You talk about football or whatever.
I think it might help Noah to just live the life of the average programmer, and not go to all these political or tech conventions where your brother image has a life of its own. Not to socialise exclusively with people who are in the same line of work as you are.
Also, some people participate in the "scene" while others don't. I used to go to more meet-ups and hacks-a-thons, but not so much anymore. I am not sure which is the norm.
Maybe its also a thing more with web development and start ups. Where the whole company can be mostly tech people, and where most people are young (so socialize outside of work more).
Somewhere I can get involved?
A couple I would recommend are the React meet up, usually held at Facebook's office, and Functional Programming for the Web, both run by an agency (I think?) called Red Badger - but obviously that depends on what your interests are!
Have you got any experience in London with meetups for people looking for work? I will need to hire at least 2 more devs this year for my startup and have no clue where to start. Certainly don't want to use a recruiter...
Another good bet is to spend a month in a coworking space. There will be events sometimes. At the friendlier ones people go to lunch together. Different spaces are different though. Some everyone kind of sticks to themselves.
You can volunteer at RailsBridge or other nonprofits. There are also "hacker spaces" that you can just hang out in and work on a project.
You can also look up conferences that are coming through your city and go to them. Many people will be from out of town, but you'll meet a few local people there too.
London is bound to have plenty going on.
Sky have recently started big investment in the area, as you're probably aware, and do a Tech Event most months with various guest speakers, the next one of those is focusing on JS if that's your thing - https://www.eventbrite.co.uk/e/leedstechhub-javascript-ticke...
There's a Code Dojo - http://www.meetup.com/Leeds-Code-Dojo
There is also a Hack Space if that interests you - https://leedshackspace.org.uk
An annual Hack Day takes place, but that's usually later on in the year - http://leedshack.org - but other hack days have appeared at other times during the year (they tend to be corporate sponsored ones but if you get past the recruitment element of them, they can be fun.)
However, it's something that you can choose to do or not to do, and something that is not at all necessary to be a good professional developer.