I think that Takemura will call you for the parade after you help Panam with the Raffens, even if you haven't found Alt, but maybe I'm wrong. Anyways, during Panam's questline, V has a really bad relic malfunction and goes unconscious, and explicitly acknowledges that he/she hasn't much time left, that's why in my next playthrough I plan to do Panam's quest as last thing before the parade.
And I don't think you can do Kerry's stuff before meeting Hasako's proxy, but maybe I'm wrong
This is completely bizarre.
The game do everything to force you to run the main quest ASAP.
Relic glitches every other mission no matter Mq, SQ gigs, by the end of the Judy and Panam story arc you catch major malfunction that sends you into coma, with Judy this is done underwater so you can be glad that the girl has a strength to pull out dependable on cyberware body.
At the end act 2 it is said that you almost flatlined with comment from Johnny that you need to meet with Hanako ASAP, and this will trigger the point of no return.
Like really this is making this game in RPG terms completely unrepeatable.
There are 2 endings that permit playing after MQ, Panam that could be retcon that you have some stuff to close (SQ, gigs) in the NC, and Arasaka ending with SYS could be retcon with cloning.
You can go back to playing the game with out losing the beat.