-- If a witness/person does not appear before the criminal court on the day mentioned in the summons served upon him, then the court may issue bailable warrants against him to ensure that next time he appears before the court.
-- If the witness/person concerned does not appear even on the next date, despite service of bailable warrants upon him, the court may take a serious view and may issue non-bailable warrants against him to compel his appearance before the court on the next date.
-- If the witness/person concerned does not appear even after issuance of non-bailable warrants against him, the court may draw a inference that he has absconded and is concealing himself deliberately so that the warrant can not be executed , then the court will declare him as a proclaimed offender(P.O).
So, as per law of the land you should appear before the court , further if you are unable to appear on the date , then you can inform the court by the other persons regarding your absence and in this way you will get next date of hearing.
Hence,dont take tension and try to inform the court the reason of your absence and further inform the other persons , who are going to appear before the court accordingly. You will get further date for appearing.