Call the guests according to their age and gender. If it's a boy or a girl, she's in her teens or twenties. You can call it handsome or beautiful. Everyone likes such a name. Men or women in their thirties can be called Mr. or Ms. Most people in this age group are married, so it is more appropriate to be called Mr. or Ms. For men or women in their fifties or sixties, they can be called uncle or aunt to show respect and kindness. If you are a person who loves beauty, you can also call your sister, not much older than you.