3-Day Event (Avenger Use) List of Champs to use are inside...
Here's a list of the Avengers you can use to earn points for this event: Ant-Man, Black Panther (Classic), Black Panther (Civil War), Black Widow, Captain America (Classic), Captain America (Infinity War), Hawkeye, Hulk (Classic), Hulk (Ragnarok), Hulkbuster, Iron Man (Classic), Iron Man (Infinity War), Scarlet Witch, Thor (Classic), Thor (Ragnarok), Vision (Classic); and Vision (Age of Ultron).
Putting together a team of all Avengers, and running through easy content, is the easiest way to earn points for the event. I created a secondary account on Sunday (that I plan not to spend money playing)... and I have already earned 42,000 points using only a 2* Black Widow (Hero Rating 346), 1* Hulk (289 - Maxed), 2* Hulk (282), 2* Black Panther (208), 2* Thor (180), 2* Vision (Age of Ultron) (176), 2* Scarlet Witch (170), 2* Iron Man (Classic) (166), & 2* Ant-Man (159).