You didn't really answer about the venue or anything, so it really would help to know. You may not need modifiers and stuff, just lights, bouncing off the ceiling or just aimed where ever, bare. If you take stands, modifiers, etc, it becomes a big pile of stuff, and unless you get heavy duty heavy things, they will knock over, etc, easily and it's worth considering (you will want to sand bag things just in case, especially in public space sharing with others walking around).
Buying a bunch of stuff won't just work. What and where you are shooting matters. You may not need anything other than one or two lights. Or none at all! You need to share what this place is, what the lighting needs to be like, what the end-game-goal is, etc. It will help you not spend extra money you don't need to.
I would actually suggest you get the Yongnuo 685 series instead of all those Yongnuo's mentioned. It does HSS, ETTL, etc. It also has built-in wifi receivers (built in YN622's & 603 capability) so you don't have to have a separate transceiver and batteries per flash per transceiver. The 685 series uses the YN622 protocol & the 603 or 560 protocol, so it can be used in both, in the YN622 as ETTL/HSS, etc, or integrated into the 560 series and used as a manual flash. So you can use ONE controller (the TX-622 or TX-560) and control all the flashes as they all have built in wifi receivers. So you don't have to buy any Yn622's except for your Canon 430EXII. The TX controllers handle power level, zoom, mode, groups, etc.
Do not bother with 565EXII or 568EXII nor YN600. Look at the YN685. It replaces all of those completely and has a built in Yn622 inside, for $110 (Amazon current price). Simply add a controller (TX-622). And if you want to use your 430EXII get a single YN622 for it and only it.
The cost of not buying a handful of YN622's just bought you a third flash. And the whole system is manual, ETTL, and HSS capable. Full feature.
Yongnuo 685 for Canon ($110)
As for the modifiers, I would actually suggest you look at brolly boxes over the umbrellas. Same concept. They are umbrellas with liners and they work like a softbox (spill control, etc), so they are an umbrella, collapse the same, etc, just have a velcro liner attachment and it becomes a softbox. Way better than an umbrella honestly as you don't lose portability/weight by doing this.
Godox 47" Brolly Box ($30 shipped on Amazon, prime available)
Get a boom stand. Not just any light stand. You'll want a boom capable stand. Here's an inexpensive high quality fairly heavy duty one: Adorama Boom Stand ($80) ** Note: this boom is not needed for your group stuff, this is more for controlled singles or couples. You can ignore this one for the big group thing. **
And for flash brackets, here's Godox s-brackets for speedlites (they hold the speedlite by the barrel, not the shoe, have an umbrella shaft AND have a bowen's mount, this is way better and far more stable): Godox S-bracket ($18). Well worth it.
By the way, when doing large modifiers or high outputs, I often pair flashes up. If you put two flashes together, you get +1 stop of light, which means you can use them both at one stop less of power, get more spread, and a faster recycle time on both while maintaining the output of 1 stop higher. Awesome way to get spread for a large modifier, and to not use full 1/1 power, so you can speed up recycle times. Just a thought if you are doing seriously big things, like 60" modifiers. But really, two 47" modifiers should give you decent coverage. Just increase flash output to around 1/4 or 1/2 and increase ISO to as high as it needs to be to get exposure.