Well, just when you think you've seen it all. I just received an email from a client, asking to pay the remaining 50% balance ($1350) for their wedding on 5/11/2019. Yes, that's right. I missed billing them, we had their wedding and 6 weeks later THEY ASK ME for the final invoice. I'm thankful for "found money" and I'm thankful for honest clients but this one just floored me. Don't think I've EVER missed sending some notice on the balance before.