Not provable from Scripture. The Assumption, perpetual virginity, immaculate conception, etc, are not contrary to Scripture (though I believe the latter borders very closely upon it). There simply isnt anything there about them. If an individual, based on tradition, wishes to hold to any of these, I may disagree, but have no deep-seated quarrel. Making it an article of dogma that
must be believed; that is wholly another story.
Well, certainly, the Christmas and Easter stories are in Scripture

Scripture alone does not mean scripture only. Tradition has it’s place.