I am going to play in the Vienna Open (
Homepage) in August probably. I won't know for sure until the beginning of August, though.
Fwiw, this is the playing venue:
Wiener Rathaus. Very stylish.
But it's not as big as Pardubice, obviously. Based on the two last Vienna Opens, I'd guess there will be about 200 participants, 30 of whom are GM or IM.