A sample sorry letter when you cannot make it to an event or a party and you have to politely decline the invitation.
Sorry but I cannot make it to your birthday party this Saturday. I know it will be a huge and cool event and I feel really sorry that I won't be there. I'm currently dealing with some family issues I can't bail out on. I hope you understand. Eat some cake for me and enjoy your 35th! Have a blast love!