What happens on a name day can vary depending on the individual and their cultural and religious traditions. However, in many cultures where name days are celebrated, the day is typically marked with special greetings and small celebrations.
On a name day, friends and family members may wish the individual well, send them cards or messages, or even give them small gifts or treats. Some may also attend a church service or participate in religious rituals associated with the day.
In some cultures, it is traditional to host a small gathering or dinner in honor of the individual, where guests may enjoy special foods or desserts associated with the day. For example, in Greece, it is common to serve a special cake called vasilopita on name days.
Ultimately, the specifics of a name day celebration will depend on the individual and their cultural and religious traditions. But the day is typically seen as a time to honor and appreciate the individual, and to celebrate the special bond between the person and the saint with whom they share their name.