You should say:
The event was a surprise birthday party for my best friend. It was her 25th birthday, and I wanted to do something memorable for her, especially since she had been feeling a bit down lately.
I started planning about two weeks in advance. I booked a small rooftop café, created personalized invitations, and made sure all her close friends were available. I also decorated the place myself with balloons, fairy lights, and photo collages of our best memories.
My cousin and a few mutual friends were a huge help. They handled the cake, music playlist, and coordinated with guests to arrive early and keep the surprise element intact. One of them even distracted the birthday girl while we set up everything.
I think it was successful because everyone had a great time, and more importantly, my friend was genuinely surprised and deeply touched. She got emotional seeing everyone gathered for her and said it was her best birthday ever. That made all the effort truly worth it.
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