Easter is an exclusively English name for that Holy Day, in the vast majority of other languages and cultures it is referred to as Pascal or Pasca, from the Hebrew Passover as it occurred right on that Feast day. Easter simply means “dawn” in Old English and it’s only link to Paganism comes from the writings of Saint Bede the Venerable, who referred to the Anglo-Saxons at one point adoring a goddess referred to as “Easter,” (which again, simply means “dawn”) most scholars doubt that this goddess ever existed and that St. Bede was mistaken about what he was witnessing, most likely, “Easter” was simply just a title for Frigg or Freya. Regardless, there is no more pagan connection with the English word “Easter,” than there is with the English words “East” and “star,” which also have roots in the word “Easter.”
The only pagan feast day that shares the same date with Christmas is the feast of Sol Invictus, and all the accounts that record the feast of Sol Invictus being December 25th post-date Christianity. I mentioned in another post on this site that there is actually internal evidence in the Gospel of St. Luke showing, that Christ was born on December 25th.
The only thing pagan about All Hallows’ Eve is that it takes place in the Autumn; before that and back when there was only the Feast of All Saints’ Day, it was celebrated in May and in fact still is in both the Eastern Catholic and Eastern Orthodox Churches.
With all due respect, if all you get out them is “fun,” why do you need them at all? Why just throw your own parties whenever you like?