Many airfields will not allow out of hours, some will. You need permission to land - that does not mean on the radio but from the "landowner" this can be a case of phoning up the day before or you may need to sign some sort of indemnity. If they have a frequency then the normal thing is to make blind calls on the normal frequency.
Having said that I will be surprised as a student if your instructors agrees to you doing a land away into a field with no services!
Last edited by foxmoth; 30th Dec 2014 at 21:08.