If you are looking for the extraordinary form of the Roman rite - which is loosely referred to as "Tridentine" or traditional Latin Mass, you will want to check out WikkiMissa. Just keep clicking on the map to get to your area, or an area to which you will be traveling. You can choose from several languages too. It's a worldwide tool!
Assumption Grotto is listed!
h/t to Fr. Z and Fr. Tim Finigan