I don't have plans for the summer yet and - depending on work - will probably not play a tournament. From the top of my head I can think of three tournaments that might be interesting for you:
1) Olomouc Chess Summer, August 1st-9th, 9 rounds. They also have closed GM and IM tournaments (though kind of expensive...). Beautiful small town.
Link
2) Husek Vienna Open, August 13th-19th, 7 rounds. This is not the "Vienna Open" which is only held every two years. But Vienna is a great city, and the prize fund is 15k €, so it should be a strong tournament.
Link
3) Sants Open Barcelona, August 17th-26th, 10 rounds. But you probably already know about that one.
Link
I'd look around on the FIDE site (
Link) to find something suitable, most of the big tournaments are listed there.