I totally agree with the above replies. It always amuses me when someone sends polite notes to inform others that they are going to be disturbed big time. Not ask, but tell. As someone else suggested i would respond with an equally polite note telling them to have fun just this once but to be fully aware of the noise laws., particularly those that state people have the right not to be disturbed by excessive noise at any time.
Btw I’d love to know what the token gift was, nothing less than a magnun of Dom Perignon would appease me. 🙂