Classifieds /
Wedding reception in Katowice, Poland [14]
I'd definitelly recommend finding nice venue, but not a Hotel. Things like Sala Weselna, Bankietowa, rooms in smalish palaces and so on usually offer such things with catering (sometime they don't provide cakes). Problem is that good ones are usually booked two years in advance, that's why people sometimes choose strange wedding dates to fit in. Same thing with bands, usually booked.
As for alcohol 400 bottles of vodka seems an excess, unless we are talking about extremly boozy family. Polish standard is 1 liter of vodka per person (calculated for everyone, including children), it should be enough. Usually you can get a deal with stores for them to accept the leftovers. For last 10 years people usually have some other alcohol available (beer and wine) for young people and not so heavy boozers.
If you're not in situation where all of family is near some area, you can always find a place whith hotel rooms, which comes handy for out -of-towners.
I'd recommend looking for something like this: villanatura.pl/galeria/villa_natura mind it's not a suggestion, it's far away from Katowice, just to show you what type of place I'm talking about.