So the registration did go through. Here's an email I received from the event organizer:

Hello all aimpunch open team managers!

Registration for the tournament ended two days ago, and although we did not get the turnout I had hoped, we still have 6 teams ready to play for their pride.
Because there are only six teams, we have reduced the tournament to one day. The format has changed to double elimination best-of-1 with a best-of-3 final.

The new date of the tournament is the date that would have previously hosted the semis and finals, Saturday, May 21st. The first match will be at 10 AM PDT.

If your team cannot make this date please inform me.
The seeding is random and your matches will be posted soon.
Inferno has also been removed from the map pool and Nuke will be taking its place.

If you have any questions or concerns, feel free to email me back or talk to me on Steam.

Thank you,
Connick | TheSabreSlicer