music festival at sea world san diego

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I planned our Sea World visit and booked Dine with Shamu, then just found out that there is going to be a "Sea to Shining Sea Music Festival" on that day. The music acts are scheduled to appear at various stages around the park. Does this mean that regular shows on these stages will be cancelled, and will the park be really crowded? My family and I would be really disappointed if we go to Sea World and the usual shows are cancelled. Should I try to rearrange our visit for a non-music festival day? Has anyone been to Sea World during this music festival (this is supposed to be the 6th year, I think)?