I was always of the impression these would spawn randomly, and potentially between the various factions or with police while rocking all kinds of doomsday devices.
Some examples that I think would be cool.
- Scavs staging a mass-abduction event. And on who ever's turf they do this, that gang goes violently for the attack.
- Maelstrom dealing in some lucrative heavy (advance) ordnance powerful enough to level a city block.
Police (or gangs) franticly attempt to stop them.
With Maelstrom specifically, have them engineer more flatheads-like weapons.
All the gangs should have events where they are at the throats of other gangs in a turf-war.
- Wraith doing vehicle dealings in the city where they offload powerful missile launchers (like the one Panam has)
And police (or gangs depending on who's territory) have to stop them. Imagine having some Nomad lunatic firing a missile launcher in NC.
Assault in progress's could do with random spawns as well as make them more memorable by giving it some unique/challenging, compared to ordinary gunfights.
Specifically since I'm again playing some Fallout 4... Prime example: Yesterday I fast travelled to around Gunners Plaza, but Children of Atom had taken the area and Gunners were assaulting them. The fight aggroed Super Mutant Suiciders from the place they control next to it.
I witnessed 3 nuclear detonations, a 3-way fight between those factions and when only stragglers remained I came in with sniping Gauss Rifle.
But thát was epic fun!