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Their COVID-19 policy page mentions that this is being run by Vitis Events, https://www.vitisevents.com/.

They're running three events at The Brewery that week: PHP UK, Rust Nation UK, and GopherCon UK.

Are those good conferences?

I have no idea, but it looks like they've been in the event space for a while so I would expect the logistics side, at a minimum, to work well. Running several events concurrently also lets them benefit from shared infrastructure and expertise instead of being a purely one-off thing. I'd probably consider it once the speakers are announced.

Are those good conferences?

I don't know, but the PHP UK conference videos for 2016 to 2022 are on YouTube:

https://www.youtube.com/c/phpukconference/playlists

Gopher UK conference videos (2015 to 2022):

https://www.youtube.com/c/GopherConUK/playlists

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