The usual way to create admin pages is to put all models in a single admin. However it is possible to have multiple admin sites in a single Django app.
Right now our entity and event models are in same place. UMSRA has two distinct group researching Events and Entities, and so wants to split the admins.
We will keep the default admin for entities and create a new subclass of AdminSite for events.
In our events/admin.py we do:
from django.contrib.admin import AdminSite
class EventAdminSite(AdminSite):
    site_header = "UMSRA Events Admin"
    site_title = "UMSRA Events Admin Portal"
    index_title = "Welcome to UMSRA Researcher Events Portal"

event_admin_site = EventAdminSite(name='event_admin')


event_admin_site.register(Epic)
event_admin_site.register(Event)
event_admin_site.register(EventHero)
event_admin_site.register(EventVillain)
And change the urls.py to
from events.admin import event_admin_site


urlpatterns = [
    path('entity-admin/', admin.site.urls),
    path('event-admin/', event_admin_site.urls),
]
This separates the admin. Both admins are available at their respective urls, /entity-admin/ and event-admin/.