Yes ABP also uses NHibernate events. But..
ABP has already audit log feature. Why don't you use it?
If you want to handle entity insert, update or delete events, ABP has eventbus events for these (see <a class="postlink" href="http://www.aspnetboilerplate.com/Pages/Documents/EventBus-Domain-Events#DocPredefinedEvents">http://www.aspnetboilerplate.com/Pages/ ... inedEvents</a>). So, you can write an event handler to handle these events and write your audit logging code.