Around 1999-2000 the "Oslo Process" which created those jurisdictional grey areas collapsed into it's current state, things got violent and the raves ended.
Funny how "what's normal" depends on where you're from. Middle Eastern no-mans-land seemed like a cool place for a party, to 16 yo me. Frozen lake in winter seems way to dangerous to even consider. What sort of a lune would go to a frozen lake party?!!
I stayed one night in an ice hotel. Absolutely beautiful lit up by LED lights and with ice sculptures. It was pretty cold by my SO couldn't sleep as it was -10f, She said when she closed her eyes she thought, "don't fall asleep, you will freeze", so we bailed. They provide the sleeping bag/liner and instructions (no cotton pajamas etc..)
Cold can be very dangerous though, because hyperthermia makes you not think clearly about what to do next.
I also have a belief that keeping a hot beverage ready-made in a thermos (tea or just hot water) should be considered a safety item when winter camping, sea kayaking, etc. Warming yourself from the inside is more effective than trying to throw on extra layers.
[1] https://www.cbc.ca/radio/day6/episode-335-100-days-of-sean-s...
In my mind, if a lake is that frozen, we're in a war against nature.
You’re really cold? Eat. Run. Increase your insulation.
https://www.google.com/search?q=ice+fishing+party&source=lnm...
Some people go all out on the creature comforts:
https://www.google.com/search?q=ice+fishing+houses&source=ln...
https://www.campingworld.com/portable-propane-outdoor-fire-p...
Seems like it might work for a frozen-lake party, since the heat stays up off the ground; you could throw a reflective insulating blanket underneath for even better results.
What do the Canadian police do in the summer when a drunken idiot is terrorizing the populace by riding his jet ski like an ass? "Whelp, out on the water, nuthin' we can do, eh?" I imagine it's like the U. S., where any number of law enforcement agencies have jurisdiction to write tickets and arrest folks. And though IANAL, I don't imagine the physical state of the lake water going from liquid to solid being a factor.
You probably see where I'm going with this: throw a big party/rave in the middle of the frozen lake. The goal would be to keep it on the Canadian side (where I live) but far enough out into the lake that local police have no jurisdiction - IANAL but my primitive thinking was to see if you could situate it where it would require federal intervention, which seems to me unlikely to materialize in time to stop a party.
In any case, we would be in the middle of a very large lake, and I'm not sure that there are any laws preventing throwing a party there in the first place.
Naturally, to be a welcoming environment, a party like this would greatly benefit from a huge bonfire, raising concerns about risks that are less likely when you party on dry land, but I thought it was a fun idea...