The latest test was from 3 to 14 (to 16) of July; the next one will be later during the year, announced well ahead of time.
The game is still in Pre-Alpha phase so we have a long way to go until

The game is in pre-alpha stage and every couple of months there are tests, open to the public. Unless it's during such a test, the servers are down, yes.
Only Supporter and Honored accounts can

Not to be rude, but ... AAAAAAA, dude, REALLY? 
Too bad if all you have is only toxic thoughts about the other people.  With time these will give you indigestion and will rot your teet

When time comes, the next test will be announced here and on the social media and Discord, so everybody will have enough time to prepare. Meanwhile there will be some surprises down the road :) , j

I personally think that a "class for people with disabilities" is the completely opposite of what inclusivity means, and not just because it will be abused by people who want to use the simplified