Chess tournament organization question.

If I can fit a tourney into my schedule and it is fairly close, I will try to play. Sections or Open, provided equipment vs bring my own doesn't matter. Also doesn't  really matter if there are age limits or not.

I would be ok with pretty much anything you sugested.  My only hesitancy is that some kids do not know how to act at tournaments.  

lol. here there is no tournament in which players must bring their own chess set. In all tournaments, chess sets, clocks, notation sheets are provided.

My experience is the exact opposite.  But then again, maybe you were being sarcastic.  Or maybe the French do things differently.  It's difficult to tell with comments on the internet, lacking the cues of vocal inflection and body language.  Anyway, in the U.S., open tournaments almost always require players to bring their own equipment.  But scholastic tournaments often supply the chess sets, and usually don't use clocks since most children aren't serious enough to own either sets or clocks.

Regarding the issue of children playing in open tournaments, it's fine as long as they don't outnumber the adults, in which case their natural enthusiasm and lack of experience tends to lead to too much noise and running around.

In Europe it is standard for the organizers to provide equipment. 

In fact, I believe it is standard for the organisers to provide the equipment everywhere EXCEPT in the US? This may just be Australia/NZ and Europe, but I think it's the same in most asian tournaments too? Feel free to correct me if I'm wrong  

not only standard but mandatory, I never saw any tournament requiring players to bring their own chess set/clock/notation sheet in Europe and I played in many opens

Are there large open tournaments, with say 200 players, common in Europe?  If so, the organizers provide the clocks too?  If so, how can they afford to do this?  I'm really curious about the business model.  For organizers in the U.S., I think the financial burden of providing hundreds of chess clocks (for example at the World Open) would be too much.

Besides, most U.S. players would probably prefer the freedom to bring our own equipment. I know that I definitely prefer a chronos clock, and I own one, so why not bring it? (Of course if my opponent has black, they choose which equipment to use). Don't European tournament chess players generally own equipment to bring with them for casual games at the cafe, bookstore, park, etc? 

Yeah, for e.g. Cappelle-la-Grande open 2016 = 538 players. Clocks, chess sets, etc are provided by the federation. It means, that at the end of the tournament, all clocks and chess sets are given back to the federation who will borrow them again for the next open.

For casual, non-competitive games, not played in chess clubs, it's different of course.

Which Tie-Breaking model one should use if some players left the tournament after 5 rounds of a 8 round tournament ??

The same tie-break method you were going to use before they left. You shouldn't change it if the players expected a certain method.

I live in the US and I can say that the majority of tournaments sets are not provided, but a couple of them there are:

1) The National Open - June - Las Vegas

2) The US Open - July/August - Location Varies

Of course, in most tournaments where sets are provided, the sets are horrible because they aren't weighted, and when you get into time trouble, adjusting knocked over pieces constantly is an issue.

As for Clocks, this is one major issue in the United States, and one of my pet peeves about the USCF.  Why the hell doesn't the USCF just follow FIDE regulations?  If we didn't try to re-invent the wheel, the Chronos would be dead, useless, and unusable in tournaments.

I actually hate the chromos for multiple reasons:

1) Half the users of Chronos clocks put the stupid beep on.  In FIDE, these sounds are illegal.  Only time a signal or sound is allowed in FIDE is when one's clock expires because the TD can call time in a FIDE event, unlike USCF where the player must call it themselves.

2) In "Increment" time controls, let's say G/90 with a 30 second increment per move, you get 30 seconds for each move, NOT 30 seconds AFTER each move!  Chronos is set up like USCF's interpretation, where at move 1, you have 90 minutes, and 30 seconds are added on AFTER you play say, 1.d4, and hit the clock.  In FIDE, you get those 30 seconds are every move, including move 1, and so when the clock is hit, White's clock is supposed to read 90:30 (or 1:30:30), and White makes his first move, 1.d4, and hits the clock.  With the Chronos, you are always 30 seconds behind everyone else, whether they are using the ZMart or one of the many DGT clocks.

3) Changing batteries in a Chronos SUX!  You have to unscrew these tiny screws that strip easily, make sure you don't break the wires when you open the device, and replace the batteries.  The rest of the clocks, there's a thing you snap out and put in batteries, similar to any child's toy that operates on batteries!  SOOOOOOOOOOOOOOOOOOOOOOO much easier to change them, and for someone like myself that plays constantly and has to change batteries once a year, the Chronos blows!

In any FIDE rated event in the United States, if the player is smart enough and can explain the differences between the Chronos Clock and either the ZMart or DGT clock, and since FIDE rules must be followed for all FIDE rated events, even if you have Black, your opponent could override you with his clock because yours doesn't meet FIDE standards!