No good for June/July as end of term is nigh, but if they're looking for something in September they should approach the Universities and Student Unions. Used to help promote a few bands ages ago and this was a sure-fire way of getting gigs.
Also ISH - International Student House does regular gig nights, not sure who to speak to now as ages since I had anything to do with them but you could google them. They operate all year round, not just during term time.
It looks like you're new here. If you want to get involved, click one of these buttons!