I think it's worth it for the BBQ alone,so it's definitely worth visiting on these days.Around 11 am or so they open the BBQ food booths and the BBQ buffet in the pavillions special events area.We've done the buffet the last two years and they basically have everything a BBQ buffet should have and more.Then the concert starts at 4pm and runs for an hour or so.You can also check out the one at Busch Gardens held on Sundays,the difference is that they don't have the buffet but instead food booths from different areas known for BBQ like Memphis,Carolinas etc..Two years ago we went on a perfect sunny day to the one at SW and everything was packed along with the Hall and Oates concert at the Bayside stadium.Last year we went on a cold wet day and with temperatures in the 40's and the buffet had like 1/200th of the people that were there on that previous visit,they even had to move the concert indoors to the theater that holds the cirque style show.The next day we went to the event at Busch Gardens on a much nicer day and as expected it was packed, but so worth it.