From early June (current time), things got rewound back to early May (the time of the 'snap'). So those who were still alive have their memories of the time that passed with the missing still gone. And then those who were missing, as well as those who remained, created new memories of May-June since being reunited. So everyone who was left alive lived through May and part of June twice. Then came July and so on, which everyone only saw once. We're currently in October.
Everyone - mutants, Avengers, Revengers, Asgardians - are welcome to help build Vernal (veer-nahl) Asgard, and to live and work there, doing whatever they might do that could be helpful or useful or interesting.
Vernal Asgard is tethered to the land near Breakstone Lake on the borders of Xavier's property. Due to the staff being involved in the construction and development of the new city, some classes of Xavier's are now given on the floating land mass that is Vernal Asgard, and some are still given in the school proper. Asgardian students are welcome to attend classes at Xavier's, as well.