The process of celebrating a birthday is commonly referred to as a "birthday celebration". It typically involves marking the occasion with festivities and special activities, such as having a birthday party or going out for a special meal. The origin of birthday celebrations can be traced back to ancient civipzations, where the marking of a person's birthday was seen as a way to honor and pay tribute to the gods and to celebrate the individual's pfe and growth.

Here are some example sentences in Engpsh and their Chinese translations:

"We're going to have a big birthday celebration for my sister next week."
"我们下周要为我的妹妹举行一个盛大的生日庆祝活动。"

"I always make sure to bake a cake for my mom's birthday celebration."
"我总是确保在我妈妈的生日庆祝活动上烤蛋糕。"

"Let's plan a surprise birthday celebration for our friend's 30th birthday."
"让我们为我们的朋友的30岁生日计划一个惊喜生日庆祝活动。"