It could even be 'just for fun' or 'to have a good time'. It may be to celebrate an important event in the local community or even a local gala day. Groups brainstorm and report back. Plan a wide variety of activities to appeal to the widest possible audience. Involve other schools in the area by letting them know about your festival and asking for their ideas and suggestions.
Groups prepare , discuss and present detailed written plans of the festival.
Advertise your festival with flyers, posters and written invitations. Divide the class into groups each taking responsibility for one aspect of the festival.