The invitations are absolutely everywhere. People who have signed up for the museum's e-newsletter receive it in their inbox. Anyone who has left their mailing address with the museum receives one in the mail. Posted on the network is the following...
Consider this your personal invitation to our Halloween Masquerade party at the River Mill Museum. As stated, you will not be allowed in if you are not wearing a formal costume (of taste...my would-be vampire friend from the other night need not grace us with his presence), or are under the age of 18. Do not even try a fake ID. We will know.