Question: Is the tournament intended to be open (for anyone who wants to participate) or closed (by invitation only)?

If we want to create an exemplary tournament, it should be closed. There are two reasons for this. Someone might simply out of boredom say they will come and play, but most likely won't show up. If they do, their skill level will be very low, and we'll have to spend a lot of time explaining the rules. Newcomers are welcome in a regular tournament, but not in this one. Imagine if, in the World Cup final, a player who doesn't know about offside or how to take a proper free kick were to play – they would be screaming on the field, saying what stupid rules, we play differently on the beach. :)

Therefore, the tournament should only include players who have proven themselves. If we manage to create an ideal championship, we can then consider tournaments for beginners.

If the tournament is in Moscow, Qwerty could participate not as a player, but as a commentator.

There's no need to list all the advantages of playing in Moscow; they are obvious. But here are some potential drawbacks.
1. Accommodation. It's very expensive; even in St. Petersburg, you can find affordable housing, but not in Moscow. I'm not talking about lodging for vagrants, but how much would a decent apartment for 4-5 players cost for at least three days?

2. Venue. In principle, finding 8 laptops in Moscow shouldn't be a problem, nor should setting up a connection between them for the game. But we need a guaranteed venue, so that the players won't be kicked out in the middle of a match because the room is needed for a meeting of veterans of the Ministry of Internal Affairs or a club of non-alcoholic vodka lovers. ;)
Again, renting such a venue might be expensive.

3. I can't imagine such a tournament without some great players from Siberia. At least 2-3 people. But how expensive is it for them to travel to the capital.
That's why I was writing about a possible strategic partner – it would be easier to solve points 2 and 3 from the above.

Now, regarding the composition of the championship. Again, we need to talk to people about the mandatory requirement of writing a report after each game and completing the tournament. A possible scenario: a person is included in the tournament, arrives, possibly plays one round... then meets friends, plays poker, drinks... in the tournament report, it will be said that the player suddenly fell ill and could not finish the tournament...
What if there are 2-3 such people?

Gynnar (a very strong player from St. Petersburg, who loves Heroes very much), Brennan (an excellent young player from the Moscow region), Navuchodonosor/Captain (one of the strongest players in Heroes II from Ukraine). In addition, there are two very strong Heroes II players from St. Petersburg: DR28 and SDV. I haven't seen their reports on online games, but I know they play online, and according to Qwerty, they have been among the strongest players in the Russian-speaking internet for offline games in recent years.
Next. Kama is a strong and thoughtful player from Moscow; when he's "on," he can beat any opponent.
And of course, the living legend of Heroes II – GreatGenius (Moscow)!

These are excellent candidates; I've communicated with many of them, and I've been friends with Sasha Horn for a long time. The only thing is that we need to talk to Gynnar in particular – he is fanatically fond of poker. In case he meets the first Moscow poker player, there is a possibility that Heroes will immediately take a backseat. :(

Qwerty, I have a request: you know the Heroes of Might and Magic II players better, and they know you. Talk to the guys, who can play in an offline tournament under these conditions? If we can gather a team of at least 8 people, we can start negotiations with potential partners.

P.S. Please don't include me; I'm not a top player, but I would definitely come to cheer and watch, and I wouldn't be alone. But I will gladly provide all possible assistance.