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1·Except they were not in a town hall but in a FBI booking room.

区别是他们是在联邦调查局的预定房间而不是在市政厅。

2·Participation Fee: free of charge. The organizers will offer exhibitors exhibition hall, hotel and tickets booking, and guides, as well as recommend interpreters, all of which are free of charge.

费用：无参展费，主办方免费提供展厅，免费介绍翻译人员，免费提供代订酒店、代订机票及环境向导等服务。