Been to this a few times. It's good, and I expect enjoyable for the typical reader of this sub.

Basically it's a series of discussion panels with questions after. Runs over a weekend, but you buy a single day ticket if prefer.

For each time slot, you can choose from various different talks, and usually there's something interesting for any given slot. There's also time for mingling, book stalls, and drinks after.

There are plenty of somewhat famous people to spot, both on panels and in the crowd.

The main link is to the London thing at end of October, but there's also something going on in Buxton in November https://www.battleofideas.org.uk/buxton-battle-of-ideas-festival-2023/