Dear *имя приглашённого *
I am turning thirteen this coming Friday. I have arranged a small party on Sunday at the McDonald’s restaurant that is close to your place at 17.00 hours. I wish your presence on the occasion.
The party would be a great time to catch up with all our old friends and have fun just like old times.
I will look forward to meet you at the party!
Warm Regards,
*твое имя*