At this point, your landlord should have let you back in your unit. The purpose of this hearing is to prove to the judge that you need your TRO to last a longer period of time.
If your landlord has let you back in and there doesn't seem to be any more problems with being locked out, then this hearing may not be all that important. You should still go to the hearing! Explain to the judge that you got back in your unit and you are not being locked out anymore.
If you are still having problems with your landlord and you think that you need a longer TRO against being locked out, you need to prepare well for this hearing. At your hearing, you will be required to prove that your landlord has intentionally locked you out overnight. Bring any witnesses or evidence that will help you convince the court that you have a valid rental agreement with your landlord, and that you were denied access to your unit overnight.