I'm not understanding the Hallowed Blight event

Sorry, no.

Someone else who knows will come along.

Oooooooooooh

Ok, that makes a lot more sense now

I think the basic gist is roughly this:

Every Blight Offering played adds 1 Blighted Gen and 1 Blighted Hook to the trial (replacing their non-blighted counterparts up to a max of 5). I'm not sure if either spawn in by default if nobody uses a Pustula offering.

Finishing the gen awards all survivors present bonus BP (I'm pretty sure it's either 4,000 or 5,000 BP, but I haven't actually repaired one yet). These gens have pumpkins sitting on top to distinguish them from normal gens.

Killer gets a similar bonus for hooking survivors on Blight hooks (which have a yellow-orange aura when carrying a survivor).

If you have an Eternal Blight Challenge active in the Archives, then 1 additional Pustula Plant (the noisy orange flower things) will appear in the trial which you can harvest for 4,000 BP each (and to finish your challenge). The Harvest doesn't need to be done all at once (the progress bar won't reset), but you don't get any BP until you finish the Harvest action and cause the plant to wither. Up to 4 of these plants can spawn if all survivors have this challenge activated (I don't think the killer's challenges spawn these in). You can harvest more than one plant in a trial (though at that point you're basically stealing it from someone else).

Multiple survivors can harvest the same plant sometimes. It seems like they are supposed to be able to (it's how these plants worked back in 2018), but it's been completely hit-or-miss whether the game will allow that to happen so far. Though you might not be able to harvest the plants without one of these challenges active (which would possibly solve the above conundrum).

This is all based on my observations & experiences of how things are working this year and it's only day 1 of the event, so my apologies if something turns out to not be entirely right, but it should close enough to give you an idea of how this event is working.

It's barebones. What you described is exactly it. Event hooks and event gens that give you a little extra BP when you complete an event gen/hook them in the event hook.

The flowers spawn whenever survivors are attempting to finish the blight challenges in the rift.

2 years ago, they had the flowers spawn for survivors with special offerings to spawn more. You had to find the flowers and harvest their nectar to fill up a vial. Once filled, you'd have a competed vial. Completed vials would be used for getting the Hallowed Blight skins instead of using shards or auric cells. The option to use shards or auric cells were there, but you could technically get some of them without having to pay anything and grind vials. Killers had to hook survivors on special event hooks which would give a little bit of nectar to fill up the vial. You could only get nectar once per event hook, so you weren't able to use the same hook again to gain more nectar.

The issue with the event two years ago is that survivors would not do gens at all since they'd go around the entire map to farm for nectar. Once they had completed their vial, they'd alert the killer so they'd get hooked and throw the game to move on the next game. This sucked because throughout the majority of the event, survivors did not do gens so hardly anyone would escape. For killers, it was harder to harvest 1 vial during the match because they needed a lot of hooks, and remember - only event hooks granted them progress for their vial. In addition, only like 2 or 3(don't remember) event hooks spawned, so if no one burned offerings, no extra flowers or event hooks spawned.

So compared to two years ago, this event is indeed very lackluster, but we'll see if spawning those flowers will cause any issue this time around lol.

little extra BP is the key word there like no point.

It's difficult to even call this an event. DBD is really going downhill lately.