Was football time at thls time? Aaaah, maybe you mean carneval? Basel is known for intense carneval tradition.My whistle/flute/fife ignorance is showing. During the time of Baselworld there was a celebration and many people walked around in pairs or groups tooting these instruments. I think it was a patriotic celebration?
Basicly no patriotic event.
On August first we have our "4. july" where we burn explosives and rockets traditionally cause we where independent country and founded in year 1291 thats our celebration day.
Bundesfeiertag – Wikipedia
de.wikipedia.org