वेदपारगा: wellversed in the Vedas, ते those, ब्राम्हणा: brahmins, तां रजनीम् that night, उष्य after staying, सहराजपुरोहिता: along with royal priests, उपस्थानम् to the pavilion (for consecration ceremony), उपतस्थु: assembled.
The brahmins wellversed in the Vedas stayed waiting all night and assembled at the pavilion (for the consecration ceremony) along with royal priests.