Will the school remain/stay/be open until the fifth of May? Is the school going to stay open until May 5th? Will the school be in session 'til the fifth of May? Will the school remain open until 1 PM? Is the school going to be open 'til one o'clock? Will the school still be open at one in the afternoon? The school's staying until one o'clock on the fifth of May, right?

Thanks for good answer. Actually, I wanted the sentences in the question form using 'when' If new session starts from 1st april and closes on some date in the month of may. Session doesn't end as again after summer vacation it opens in July. So, if I have to ask principal about closing of the school in the month of may the date I don't know. Can I ask: when will the school get closed? Until when will the school remain open? Likewise, if I go to drop my son at the school and I don't know when will the school close the same day. What should I ask.