How to Politely Decline an Invitation and Suggest an Alternative Plan

Dear Dang, Thank you so much for the invitation to The Posity. I truly appreciate it, but unfortunately, I won't be able to attend as I will be in Bei Lie City with my parents. However, I would love to meet up with you and suggest doing something else another time, like watching a movie or just hanging out. If you'd like, we can plan something soon. Once again, I apologize for not being able to attend your party, and I hope we can meet up in the near future. Best, [Your Name]