not sure of any where u can stop changes after first lineup chosen, up until kickoff. I entered draftkings for week one but I can still make changes to roster before 1 pm sunday week one, except for thurs players.
at myfantasyleague u can do leagues where you draft and cannot make roster changes all season. each week it looks at your roster and choose best scores to determine your team total score for that week. if u have 3 QB s on roster it would take your top scoring QB that week top 2 RB etc
you can set it up and invite whoever to join and draft, (private league). uses email draft, each time it's your turn u have 8 hrs to make pick, if times out it assigns a player and moves to next pick. most people would not take that long though. ones I did were done in few days.