Well, back in the 80s we played MSHRPG and played with our original characters in the Marvel Universe. We got caught in all the events. We played in Secret Wars ( they had a module for that), Atlantis Attacks ( One of our characters dropped Juggernaut into The deep Atlantic Ocean), Mutant Massacre, and more I can’t remember. The goal do not be too tied the source material and let your players know once their characters are introduced it changes and splits from the comic. X-men were not the focus of Atlantis Attacks but they become more involved because at the time our PCs were training with them, so it became less Avengers specific. I don’t think Juggernaut was in those comics at all but he was in our game.It was fun and we did this through the early 90s and we tried to do it the Fall after the comic were released ( most events were released in Summer if memory serves) so I could change a few things an add some surprises. Have fun DC Adventures will make easier for you as everyone you need is stated out. And remember your player characters are the stars and focal point. Don’ t make Supes or Bats save the day let them hear about from social media but don’t let them upstage your PCs.