The sentence "Registration is now closed" is correct and can be used in written English. You can use it when a period of time for signing up for an event has passed and registering is no longer possible. For example, "Registration for the summer camp is now closed, so anyone who didn't sign up has missed their chance.".
(Unfortunately, registration is now closed; the talks are to be published in a book).
If you're not attending the conference (registration is now closed), this week's adventure will give you a taste of the experience.
The registration is now closed.
Friday at 4 p.m., Saturday and Sunday at 11 a.m., Prospect Park, 16th Street and Prospect Park Southwest, Brooklyn, brooklyn.googamooga.com; $54.50 on Friday; free on Saturday and Sunday, but a ticket is required via advanced registration, which is now closed.
Registration to march is now closed, but everyone is invited to watch; (212) 831-7272, elmuseo.org.
Registration to this event is now closed.
Registration for this event is now closed.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com