A substantial dinner of roast beef , plum pudding and beer, was given to the whole of the children in the National British and Sunday Schools of this borough, in celebration of the day on which slavery ceased in our colonies. The dinner was served up in the market-house, by Mr.John Edwards, of the Cross Keys Inn. The children , amounting to upwards of eight hundred, afterwards paraded the principal streets of the town, accompanied by their teachers; each of them wore a neat and appropriate medal, which had been presented to them on the occasion; and they appeared highly delighted with their day's entertainment.