You've plenty of choices. Paris would be a great end as you can take the Eurostar to London. It's also an amazing city. Festival La Merce in Barcelona is one of the greatest travel experiences ever. It runs from September 21-27th in 2013. More than 600 free events -concerts all over the city, parades, cultural events. If you can find accommodation you're all set. You can grab food and wine on the go and mingle with thousands of happy people.