#2 The Great American Bash
Following WCW's demise in 2001, The Great American Bash was the only event that was brought back under the WWE banner in 2004. It was perfectly slotted in the month of July, mere weeks removed from the Independence Day holiday and a month prior to SummerSlam.
The pay-per-view was exclusive to SmackDown for three years from 2004 to 2006 before the WWE becoming a tri-branded show starting in 2007. One more instalment was held the following year and was scrapped altogether in 2009 (and no, The Bash does not count).
This was done to make way for gimmick shows on the pay-per-view calendar and to boost buy rates, but really, was there any more of a burning desire to see Battleground over The Great American Bash? The blue brand would benefit from the return of the celebrated event starting in the summer of 2017.