>Surveillance aside, since when has it been a human right to attend a festival in a country you are not allowed to reside in?

Forgetting about illegal immigrants for a moment, are you saying that visitors to some country shouldn't be allowed at festivals? What have you got against tourism?

There's no right to visit attractions, but there ought to be a right to privacy, and I'd personally prefer a few illegals get to unjustly enjoy themselves over the invasive panopticon required to prevent that.