I came across something a few days ago that interested me. Looks like in Ontario, the board that reviews clinical trials meets once a month. So, you miss a deadline and you just sit there for another month?

Just checked the US government website. This supports what you're saying I believe.

They met the journal requirement end of things. so maybe they have started.

A big maybe!

Can I register a study after it has started, has closed to recruitment, or has been completed?

Yes, you can register a study on ClinicalTrials.gov at any time. Please note that, in general, Section 801 of the Food and Drug Administration Amendments Act (FDAAA 801) requires Applicable Clinical Trials to be registered within 21 days of enrollment of the first participant. In addition, the International Committee of Medical Journal Editors and other journals require registration of clinical trials prior to enrollment of the first participant.

See FDAAA 801 and the Final Rule for more information.

https://clinicaltrials.gov/ct2/manage-recs/faq#after