Tan buena is the corrct andwer. the question is feminie there your answer will be feminine
You CAN put
1: Para mi quinceañera yo ago una fiesta muy grade solo para mi.
Translation: For my fifteenth birthday, I have a huge party to celebrate me.
2: Cuando yo cumplo los quince años, mis padres hacen una fiesta de quinceañera y invitamos a todos.
Translation: When I turn fifteen, my parents have a huge party and invite everyone.
3: Para mi quinceañera muchas personas me dan regalos muy bonitos.
Translation: For my fifteenth birthday, my friends and Family give me really nice gifts.
Hope this helps :D
