Special occasions
“When booking your cruise, there is often the option to add any notes or additional information about your booking. If it is a special occasion, such as a birthday, anniversary or honeymoon, you are more likely to be upgraded.
“This is because doing so is mutually beneficial to both the line and yourself, as an upgrade can make your adventure more memorable and usually leads to a great review. Just make sure to give the line plenty of notice in advance, as telling them a few days before will not give them enough time to make accommodations.”
Cruise lines always like to reward their customers and a special occasion is the perfect time to offer an upgrade.
Even if guests don’t get a free upgrade, they might get a special treat such as an extra cake or a bottle of fizz.
Source: express.co.uk