Barrett, Grey, and Taylor have all had week long vacations within the past two months, so barring any illness they should be in the show. I don't believe Ashley Park, Kate Rockwell, or Erika Henningsen have taken an extended vacation yet, so it's possible they have something upcoming.
"Oh look at the time, three more intelligent plays just closed and THE ADDAMS FAMILY made another million dollars" -Jackie Hoffman, Broadway.com Audience Awards