The Naschmarkt is the largest market in Vienna. Here you can buy food, souvenirs for family and friends, or just enjoy a good company with a glass of wine. It works from Monday to Saturday, on Saturday there is a flea market on its territory.
Erntedankfest is a harvest festival that took place in Vienna on 6-7 September. I got to it quite by accident (actually, like in all places in Vienna), I heard loud music and went to it.
Belvedere is not just a historical palace complex, but also a very beautiful place for walking. Beautiful baroque architecture, manicured lawns, many fountains, a botanical garden, museums.