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Polish Wedding March & Funny Hat [37]
Oczepiny are very common. The extent of what happens though may differ.
The simplest version is I guess for bride to throw the veil by the shoulder while being surrounded by the group of unmaried women, the one that catches the veil wears it for the rest of the evening (or just 10 minutes, it's up to the really), then the same things happen with grooms bowtie. Then newly appointed coplue dance (optional). That's the basic version.
More complcated version can also contain different versions of party games like krzesełka (youtube.com/watch?v=t_-KPmSD7IA), or some kind of funny theather (youtube.com/watch?v=Ba6XoMjt7q8).
In wielkopolska (not sure if it's tradition in other parts of Poland) przyśpiewki were quite common, now being phased out but still happen. I like this part a lot. I tried to find it on youtube but actually didn't find correct version where people line up to the mic, sing przyśpiewka, and then dance with bride/groom depending on gender of the singer. They are often quite offensive, especially to mother in law. My favorite one is "tesciowa, tesiowa, nie otwieraj gęby, bo wezmę kamienia i wyrżnę ci w zęby!" :).
Also in wielkopolska (and some other part of poland) money dance is not common at all, you just give the money in the envelope when you give your wishes at the venue. I had such funny situation when we had śląsko-wielkopolskie wesele in my family when father of the groom insisted on the dance and then showed up with this big pile of 10PLN bills and gave fat stack of money and people around watched in disbelief as they already gave their gifts.
Also gorzko, gorzko is obligatory as is ona temu winna.
And as the rest said, hat thing is not Polish tradition.