How do we know that it's a "x2" weekend etc!

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What id like is an explanation of how to odds work, not the rate but how it actually works, for example do we all actually have our own individual luck, by this I mean when we reroll for items whilst farming thats our own individual luck, nothing that anyone else loots can effect what we get,( excluding items such as the planar pendant). Or is this whole game/ system, for example every certain amount of crates opened on a whole a arcane drops or mythic drops or every time the system decides to drop a arcane the next person to open a crate gets it, in my opinion I think it must work in a way simular to this, which sort of gives everyone an equal chance to get "lucky", but I don't think we have our own individual luck, where no matter how many crates are opened or how many arcanes are looted that it wont effect the way out luck turns out, because it will.

In a sense there is actually no such thing as luck when it comes to crates loot or anything, its about timing... happening to open that chest at a specific moment, or happening to be at the end of arena run at a specific moment, but I suppose by most its what would be interpreted as getting " lucky", however getting lucky is based on many other factors its not really random.

In the case of a gem turning into a super gem, what happens is that when you start the upgrade process, the server stores off in the database which item and which gem item you've used to initiate the upgrade and at what time it started. After the necessary elapsed time, the player can initiate the retrieval of their newly upgraded item, and it's at this point that the server looks up which gem they were using to upgrade their item. The server then picks a pseudo-random number from a global random number generator (so it's not player-specific), and then compares it to the threshold for supergem generation (defined in server-side data). If the threshold is met, a supergem is created in the indicated slot. Otherwise it results in a normal gem.

Does that answer your question, or did I misunderstand?