One of the oldest organizations in the country, the National Hotel & Tourism Association, Asonahores, will be celebrating its 50th anniversary with a mass at the newly restored Convento de los Dominicus in Santo Domingo at 6pm on Tuesday, 19 June, followed by a toast at the Quinta Dominica on Calle Padre Billini at the intersection of Duarte street in the Colonial City from 7-8pm.