Hard to find story

The story is hard to find because while I know it is in a medevil\fantasy setting, and may be incomplete

MC is like in most stories the butt of many jokes by peers

there is a 'searching' that takes place at a festival of some kind

The local cause of trouble is a boy who while high-born, isn't as highup the chain as he believes and his father had become tired with bailing him out and is taken as a sqire to a knight.

The chosen have to travel, and MC discovers they have magic and a warrior?