After the workshop, we plan to go to a Viennese restaurant & beer garden in the inner city for dinner. The restaurant is called "Zattl" and is located in Schottengasse 2, 1010 Vienna.
Additional info can be found on their website (Link to Zattl Website).
On Sunday, we suggest to do some sightseeing in Vienna ;-)
As in many other major cities, "Free Walking Tours" may be a good option for being shown around and deciding on the price afterwards. A possible provider may be https://primetours.at/tours/free-walking-tour-vienna-classic/. We might think about a group reservation or individual reservations in case enough participants are interested.
Alternatively, the city can of course be explored by oneself. An example of a walking route passing by a lot of the famous buildings in the city center can be found at https://www.city-walks.info/Vienna/City-Tour.html.