Some questions!
-How much stamina drinks does it take to get into the top 2000-4000 of an event? Is it even possible without purchasing drinks? How much stamina should I have? How competitive will Kaede's events be?
-Also about events, what's going on in the current one? I don't understand at all...
Havent been playing much recently but i can still help.
I managed to get rank 2800 (so top 3000 for a special outfit) in idol royale having saved up AP drinks for 2 prior events (so buying those from rare medals and then the 1 drink ones from just doing the event with round specific but not using them). and about 200 MY half-stamina drinks and maybe 10 full MY stamina drinks.
(DONT use drinks that are not "MY" - those are used as a currency to buy idols!! you should never use them to restore stamina).
You can save all this so you don't have to buy it for $$.
Also worth nothing I have 600 total stamina (I put everything there, guild points, star emblem points and I also fully finished all areas for the point distribution)
I would definitely recommend using any drinks you can to fully finish all areas, because the more your total stamina is, the bigger benefit you get from the drinks you acquire in the future (so you might use 100 half drinks to finish all of it, but you will have double the stamina which means once you get 100 more drinks [should take like a month or few] you will already be even and start benefiting from the investment).
I also didn't miss any naturally refreshing drink usage in the time i was awake, so every 1 or so hour except the tie i was sleeping I used an attack to use up those drinks.
And then ofc you need a fairly good idol setup, you can check the guide for cheap CUTE setup i made few pages ago
hereAs for the other questions I havent been playing much lately so Im not playing this talk battle show, but I didn't like the changes they made for the past like 2 talk shows, that there are like the golden times, but even during those its sometimes hard to do anything with an inactive team (which is why i would suggest focusing on a solo event like idol royale for high ranking).
Lastly where do you see the next even will be Kaede? Or do you just mean sometime in the future?
She is popular I guess and if it is going to be a voiced card then it will be expensive and lot of people will want it, but depends on waht type of event it is.
Also I wouldnt count on having a ranking 22cost SR for Kaede from event, if anything it they will make it a gacha only thing. But for an event it can take years before she is in there (there is like 200 idols but only 52 weeks in a year so you can see the math for an idol to be a ranking SR)
But there can always be an 18 cost or a rare from just doing the event (and those are easy to get and cheap to trade for).
But yeah I am waiting for 22 cost Mirei ranking SR but I suspect there will just be another gacha with her sometime this year if they ever get her a voice since she did appear in the anime for a moment.
PS: in the old guide for team composition i was talking about 21-costs being the highest, the current new highest is 22-cost with a tremendous non random buff to front members and 4-5 back members, so if you have drinks to spend (prepare 300+ for just SR) probably wait for a 22-cost of a girl you love (hopefully it will come this year).