The crowd seems to enjoy it, so the band plays an endless gipsy tap where the band members compete with each other to keep introducing new tunes into the medley. The same mistake is made with waltzes. The band plays a waltz. A lot of people take the floor. That is a disaster from a dancer s point of view, no matter how logical it may be to the band.
Bands typically play waltzes far too fast.
For a general audience about 100 to 105 beats per minute would be better. If you have music you must play faster announce a quick waltz, but keep it short because it's exhaustive to dance. Dancers in the audience might volunteer to lead-off a particular old time waltz. St Bernard's, or the Destiny are fairly easy. More people probably know the swing waltz, but they often dance it badly.