Superhero comics had crossed over many times before 1984,with various crises on various earths and plenty of Marvel characters invading other characters' titles, but the comic that set the template for the event series as we know it nowadays is undoubtedly Marvel Super Heroes Secret Wars, and the first issue of which was released on this week in 1984 (cover dated May).
The brainchild of Marvel Comics editor-in-chief Jim Shooter,the series spanned 12 issues and threw nearly every Marvel Comics character into the mix. It even started the trend of more than one artist taking on penciling duties, as Mike Zeck and Bob Layton traded off every few issues.
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Source: comicsalliance.com