The International Wine festival which is arranged every year in the Buda castle area will be arranged between September 10th and 14th in 2014. If you are in the mood for tasting Hungarian wine, then this is the number 1 festival in Hungary for that purpose.
If you want to know more about the International Wine festival in Budapest, read more in the following article.
At the festival you can taste somewhere between 4000 and 5000 different Hungarian wines, so no need to worry, you will have plenty of things to taste and to do if you decide to stay at the festival for five days. Of course you will need to sleep at some other location, but you can come when the doors open to the festival at 12.00 or 14.00 every day and stay until it closes! Enjoy the festival!