An appealing fantasy would be a great conference of the world's nations where, instead of politicians or statesmen, each country would send its leading humorists to represent it. Instead of an atmosphere of promp and seriousness that would normally be dictated by such an occasion, there would prevail a lightheartedness, with an asssembly of individuals bent on raising spirits instead of suspicions.
"if there were" is correct as well , however it slightly changes the meaning. " exists somewhere. " has never been created or has never existed.
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