Apology Letter For Forgetting to Invite
Dear {Recipient},
I'm so sorry I forgot to invite you to {event}! You know you're {one of my best friends/my favorite uncle/etc.},right? I would never in a million years leave you out on purpose.
Chalk it up to inexperience and overwhelm. This is my first time organizing a {party/wedding/etc.} and it's way harder than it looks! Now I understand the meaning of a mile-long to-do list.
Your presence at the {event} would mean the world to me. I hope to see you there! All the details are on the {enclosed/attached} invitation.
Warmly,
{Your Name}