With a little network trickery, a friend of mine and I managed to use LAN mode to connect online together and play Salmon Run when Grizzco was closed. We're going to test having two others join us later on, but it worked!
You get to choose any weapon you like or have it randomize you every wave and you can choose either of the stages to play on, but the rewards are much lower. Once we got up to 400p it gave us a random drink ticket capsule and then reset back to 0p. The points in the Shoal share between 'local' and 'LAN' mode and don't reset daily, just when you hit 400p. It took a little while to get 400p with only two people.
Twitch highlight of showing it off to our community. Sorry for hamming it up a little for the show.
https://www.twitch.tv/videos/166852998
Also, hosted a Splatoon 2 LAN at 2DCon this weekend and had a blast. Couple of pictures: