Home Events & Festivals International Glass Invitational Twitter Facebook Print About International Glass Invitational International Glass Invitational June 29th thru September 29th. This exhibition, organized by Habatat Galleries, is the oldest and largest annual contemporary glass exhibition in the country. Selected from an array of glass masters, this exhibition features the world of 26 of the best studio glass artists in the world. Gallery hours: Tuesday - Saturday 10 am - 6 pm, Thursday 10 am - 8 pm, Sunday noon - 5 pm. This exhibition will require an extra ticket above the normal admission charge for viewing.