#5 It could be a great venue for unusual gimmick matches
At one time, WWE was awash in various gimmick matches. There were hog slop matches, in which the main objective seemed to involve getting your opponent doused in pig filth rather than pinning their shoulders for a one two three. Then there were Lumberjack matches, in which many superstars surrounded the ring, ostensibly to throw the participants back inside if they tried to escape.
And there was the casket match, which is mainly associated with The Undertaker. In a casket match, you must beat your opponent badly enough that you can toss them into a casket and shut the lid. In 2008, WWE stopped having casket matches, and would not resurrect the variant until 2015. The last casket match was between Rusev and Undertaker at the Greatest Royal Rumble.
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What better venue for a casket match, or a Thunderdome match, could there be than Halloween Havoc? It would be a great place to put these type of gimmick matches so they retained their special and unusual feel.