Here is my opinion about Salmon run's special events.
Tornado: easy as everyone will make a line to launch eggs. Not too much salmonids to cause a problem.
Griller: as long the team can work together, it will go down with the smallfry.
Fog: somewhat hard with limted visibility, but teamwork will power through.
Mudmouth: easy since throwing bombs will clear salmonids. Also, the entrances are not moving.
Cohock charge: with a couple of players maining the cannon, it is easy to clear.
Glowflies: VERY tough if everyone does not handle the rush with their equipment and specials to make room.
Mothership: somewhat hard as salmonids that carry boxes spawn golden eggs with the ship occasionally stealing them. Easy if everyone works together.
Goldie seeking: depends on how many values are open before the goldie appears