《诚邀好友参加我生日派对：时间地点已定，盼君赴约》

Dear [Friend's Name], I hope this letter finds you well. I am writing to invite you to my birthday party, which I am organizing because I want to celebrate this special day with my close friends like you. The party will be held on [Date] at [Time]. The venue is [Venue Address]. Your presence would mean a lot to me as we can catch up and create some wonderful memories together. I really hope you can make it. Looking forward to seeing you soon. Best Regards, [Your Name]