Our TA agent noted DH and I were both celebrating our birthdays on our reservations. Fourth day into the cruise the waiters brought a cake for husband for his birthday and sang happy birthday. When they were done, I asked what happened about my birthday. So they put the cake in front of me with another candle and sang happy birthday to me. I didn’t need another cake but was surprised they didn’t know about me. Nice chocolate cake.
If you really need a celebration, you make sure it is done. Don’t assume you will get something.