Usually on the bottom tier, you and new spouse cut out a small slice together, put it on a plate and feed each other. Then someone else, often a family member with lots of experience, will take over cutting slices for guests to eat.
Controversial opinion but the cake is not intended to be frozen for a year. Couples who have followed all storage tips to a T have said it still gets freezer burned and nasty. Some have even mentioned food poisoning. The tradition of saving it stems from a time when fruitcake was the only cake source, but modern recipes do not hold up in the freezer for any period of time. Countless bakeries will make you an anniversary tier for free that is included in the cost of your wedding cake. That said, couples either serve the top tier at the reception or take it to the wedding night hotel to snack on.
The DJ usually handles the announcements etc. The photographer will be alert to the moment too. You take the knife together and cut the cake just once. Then someone else cuts it for every one and serves it, usually the venue staff (for a fee). You and your spouse can decide what to do in the moment about anything extra, like a kiss or something.
We froze a piece of cake and ate it on our one month anniversary.
Prior to the wedding our mc asked us if we would be doing a traditional cake cutting and if so, what time. I said yes and 7:00. So fast forward to the wedding, at 7:00 he announced the cake cutting and me and husband made our way over to the cake table. Several family members also gathered round. Our photographer positioned us and the mc kind of narrated and made it more exciting by amping up the crowd and guessing if we would feed eachother nicely or smash the cake on the face.
After we cut the cake and fed eachother and had a kiss, everyone dispersed and our caterer cut the cake and plated for all the guests!
I've heard that it helps to practice cutting a cake together.
As for the freezing the top tier, I suggest you don't. That way you have to buy less cake for your wedding and don't have to worry about storing the tier. You can always get the same flavor from the bakery on your anniversary.
We are doing a destination wedding in a way (flying back to my hometown for it) and won’t be able to travel to our honeymoon with the cake and then bring it alllllll the back to east coast. So to fix this problem our top tier will be eaten by my parents (who live in my hometown still). It’s a gift to them for funding the wedding and hopefully will give them something to enjoy over a couple weeks and to reminisce on their own wedding 30+ years ago.