I think that calling it a 'festival' seems a bit insulting, too, with its celebratory connotations. I can't 'celebrate' the fact that millions of men, women and children have been needlessly killed in the service of man's most ignoble institution, War. Many, many of them may have been heroic and worthy of praise, but they were victims of the ambitions of their 'rulers' and I mourn them as such.
However, 'concert', 'festival', it's just semantics.
Trying to get through prolonged/complicated grief
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