It's back! The giant contest we have a few times a year over at the SMBX Forums
is now accepting submissions for its 7th installment. You can find the thread for the contest here:
It's a relatively simple process - you must submit your level by April 22 (22:00 UTC, about 5 or 6 PM EST), and your level must be complete and can't be released to the public during the contest. Check out the thread for more info.
If you have questions, feel free to PM me here or PM any staff member on the SMBX forums (the latter is more convenient because I don't check here as often).