To perform PreDate with no memorization and no card stack, you'll need to know what card is printed on any named date and you'll need to find that card from a shuffled deck and force it.
See the VIDEO of me performing the trick that way, using a shuffled deck.
Notice in this performance that, after the date is named (which I didn't know he was going to say), I glance at the 52 graphic to learn the card at that number and then, as I fan the cards to show they're mixed, I cut the card to the top of the deck, ready to force.