JESS is the Jewish English-Speaking Society
Basically, JESS is a mailing list.
Everyone on the list receives a more or less weekly newsletter with announcements of all kinds of Jewish events, holiday celebrations, jazz and klezmer concerts, book presentations and so forth.
And also Jewish news, Jewish jokes, Jewish videos, Jewish trivia.
Are you starting to see a pattern here?
If you would like to be on the email list, send an email to firstname.lastname@example.org
JESS also organizes an annual outing to some quaint place in the Netherlands and an annual play reading. Both are open to everyone on the list.