Boston Casting sent out a call this week seeking people who can portray Pennywise the Dancing Clown, from the hit movie “It,’’ during an event on Halloween. The gig is for the Boston-based company Ghost Tequila, which is hosting a party that night near the TD Garden. If you are a performer who can resemble the scary clown, you can e-mail with a photo to bostoncastingsubmit@ gmail.com. Do not send your scary clown photos to bostoncastingdating@gmail.com. That address is for a reality show casting call for singles between 32 and 45 who want to start a family.