If I wanted to separate events over a number of namespaces how do I force them to load in the main events namespace ? e.g main is events.cljs, per namespace document/events.cljs and bibliography/events.cljs

require them

I still get "re-frame: no :event handler registered for: :edit-bibliography" even though I have required them in the main events.cljs

The most likely explanation is that you haven't actually registered them (even though you are sure you have) . OR that you are registering them after their first use. Put a println into your code where the registration is happening, and make sure you are seeing the registration.

(println "I'm registering :edit-bibliography")
(reg-event-db :edit-bibliography
   ....)

Cheers - adding the println actually surfaced the issue - I hadn't :require'd re-frame/core into the new namespace ...

clj-kondo still reports the split out namespaces as unused .. do I just have to live with that ?

Will have to defer to someone with clj-kondo experience

https://github.com/borkdude/clj-kondo/blob/master/doc/config.md#exclude-required-but-unused-namespace-from-being-reported

That’s right, if you don’t use an alias or refer clj-kondo will not report it as unused, this is exactly for things like registering re-frame events