Maybe this (in German) artical make give you some hint of where to look.
It is more scientific in nature than touristic.
Lunz am See plus a 3 hour hike in the mountains (1270 meters height) where areas can be found with tempature of 2 degrees, when in Vienna it is 30 at night.
No meantion of ponds or lakes directly, but possibly some exist.
There is a calendar of events for Niederösterreich, albeit it looks like it's in German only. You can select events by category, e.g.
wine tastings (Degustation, Verkostung)
wine festivals (Weinfest, Kellergassenfest)
For translations, try DeepL.
A random vineyard with guided tours and tasting:
Weinschauen am Weingut Sonnenhügel (translated by DeepL)
You will not be 'sent back', but the chances are that the airline won't ever let you board to begin with, and your ticket is lost (=no money back).
You will need to show the airline proof of your citizenship, in a way that is defined in TIMATIC (the database airlines use for that).
The easiest way is surely to apply for your Italian passport right away at ...
As you can see in the agendas, you are probably out of luck. Additionally, I think that most of the sittings listed named like "X-Ausschuss" are only partially public and you may need journalist accreditation to attend (especially the BVT-Untersuchungsausschuss).
More information can be found on the English website but I guess you have already seen that. I ...
Switzerland is one of the most expensive countries in the world. Most things are more expensive there.
A meal at McDonalds starts at around 10 euros for the most basic budget version, if someone is earning 20-30 euros and hour they’re considered very lowly paid.
Austria isn’t quite so bad, but after the Nordics and Switzerland it is probably the most ...