Not currently. We don’t want to add traditional hook scripts or hook directories as that leads to issues that are very hard to debug not to mention different systems within a cluster may then start behaving differently.
Instead, we’ve been thinking more towards adding some kind of webhook mechanism where you register a service with LXD which will get notified of some classes of events either in a blocking or non-blocking way. We have an open issue for implementing something like this, but it hasn’t been a priority so far.