I've been there a few times and enjoyed it. I believe that you will too.
They have a separate menu for special diets if you ask them for it, but, I also encourage you to take a look at their regular menu as well as they are pretty accommodating on alterations and I have noticed previously that some items on the regular menu can be easily altered to become vegan but are not included on the special menus.
I will be calling ahead for reservations so please get your RSVP's in before wed of that week if possible. Even if we have a few changes it is a well appreciated courtesy to the establishment to give them a heads up of what to expect before a group comes in. This is especially true since this is not a vegan exclusive place. We only have our selves to blame if they run out of their vegan items when they had no clue of the size of group coming in expecting to order it.
Thank you, I look forward to seeing some old and new faces at The Harvest Room on Thursday, April 3rd. :)