Skoda Lasky originally Czech (1934) but it would appear the tune is Europe-wide. We know it as "Roll Out the Barrel" or the "Beer Barrel Polka"

Varsoviana sounds a lot like Varsovienne a French dance (known to old Cajuns) that can be seen in Germany, so another Euro-tune IMHO. The Irish version is "Shoe the Donkey", the Irish & French dances are recognisably similar but the German version is more a display dance and more varied, though the tune is recognisable in all. Mexico & Hispanic US know the tune apparently. Shoe the Donkey is referred to as a Mazurka, which is still 3/4 time. Sheet music search (some see the two spellings as the same tune) specifically Varsoviana

Are we too late? I expect the wedding is today. I am sure if you see this "Roll Out the Barrel" will roll off your flute.

Best of Luck