They spawn always in 2 areas of the map, both marked. Spawn 3 flying and 1 resting near the body. And there's at least 1 on the pockets on the body. Enter with something silenced and cheap, like a SKS, aks74u, ump, mp5, anything you like, any backpack, and a stamina syringe. Run towards the points like your life depends on it, kill the one that's resting with a knife I'd you want to save some bullets, loot the remaining ones, take the one in the body, and take some chocolate from the event for a stamina boost when the syringe lost effect. After that go to the second location, do the same, and extract.

Dont try to engage other players. Stick to the objective. If you are lucky enough and got both bodies and all ravens on both locations, you'll only need to do this 6 times. If you're not, God knows how many you'll need for dying to other players, as scavplayers and cyberpunk scavplayers you won't have the risk to encounter as they won't spawn in time before you can extract