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Have to go with the 4th then
Further Searching:
Until the nineteenth century, mischief night was celebrated at Halloween (October 31 and the eve of winter) or, May Eve (April 30 and the eve of summer). Shrove Monday (i.e. the night before Shrove Tuesday and known as Nickanan Night in Cornwall and Dappy-Door Night in Devon)[1] was also celebrated in this way in some places. In some localities, notably Yorkshire, it occurred on the night before Guy Fawkes Night (November 4) but there are no records of this date being celebrated before the late nineteenth century and it is assumed that festivities were transferred there from the much older folk festivals.[2] An alternate view, with records going as far back as 1790, shows it was ported to halloween.[3]
So you're both right.