help with a huge mistake – volunteer appreciation

I for no reason, I have zero excuse, forgot to send my gifts to my volunteer solicitors in January when I was supposed to and was called out by my boss about it today.

End of April.

I promptly admitted to forgetting and said I would send them out tomorrow.

But how do I handle this with the volunteers? Admit to it in a note? Ignore it? Take responsibility as an individual? Skate over the fact?

I don't know what to do and I'm freaking out.

Help me please