Hi, and welcome!
My name is ***** ***** I will be glad to help with your question.
I've found a post office in Charlotte that is open 24hrs. It's only about 1/2 hour from Denver, so you might want to check that out:
Even though the post office in Denver is closed at 5, if there are mailboxes outside the post office, there's usually a last pick up at about 8 or 8:30 PM. This is the case in my area of So. FL
I hope you're able to get your mail out, today!
Please be so kind as to rate my answer with positive feedback, as that is the only way I receive recognition for my assistance. Thank you very much!Providing a positive rating will not end our conversation, should you need me for any follow-up. Simply click 'Reply' for clarification or additional information, if needed.Warmest regards,Cher