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"And there shall come a day...a day like no other...the Day of the Defenders!"
Marvel's Non-Team: The Defenders Appreciation 2014-2018
Marvel's Non-Team: The Defenders Appreciation 2019
The Defenders Appreciation 2020
The Defenders Appreciation 2021
Marvel's Non-Team: The Defenders Appreciation 2022
RECOMMENDATIONS
Avengers Defenders War -- arguably the first "event" at Marvel, this was an amazing battle of two of Marvel's biggest teams at that time.
Defenders for a Day
Defenders Indefensible - While there's disagreement amongst Defenders fans about this book, I personally love it. It's a fun look at the Defenders.
Best Defense - an old school gathering of the old team, with a call back to one of the Defenders early foes. It was interesting to see how the four separate issues lead up to this meeting.