I'm going to predict who will have an event in 2022. These are the ones who will most likely not get an official birthday this year and will have a Vocarnival event, so I'm predicting which ones would be the likely case. Here's each one who will and will not get an event:

- Definitely. She hasn't even gotten an upgrade in a while, so I'm pretty sure Sweet Ann will get an event. I'm thinking of an event called "Sweet ANNiversary" which will take place on June 29th, 15 years since her release.

- I'm not really sure about this one, but considering how she has not gotten an upgrade in a while, she could be a case here. But the reason that I'm not sure is because her birthday is in 74 days at the time this reply was added. So there may not be an event.

- Most likely. I really think Galaco will have one on August 5th if I'm right. Although she might not have a lot of attention.

- Also a most likely case for her. She's really underrated, so maybe there could be some people who would participate in Mayu's event

- I really think so as well. She will get an event on the same day as FestiCUL since she was released on the same day as CUL and a few others. Maybe something in the lines of "Avannaversary"

- Her birthday is coming soon...she's not going to have one.

- Although I would like an event that involves her, her birthday is also also coming soon. So it's too late.

and

- They might not get the attention.

- A lot of people in the community for some reason don't really depend on the newer Vocaloids...I'm not sure about LUMi, but I have a feeling she's really underrated.
I didn't put Miku and the Kagamines in because obviously their company has official celebrations for them each year. I also didn't put IA because she's going to have one by her company even though she switched to a different engine.
So here are my predictions: The ones who will be getting an event are: Sweet ANN, Mayu, and Avanna. (and maybe Galaco to a certain extent)