(Reuters) - Influential wine critic Robert Parker will make a rare appearance in Asia next month at a top-class wine appreciation event aimed at tapping one of the most potentially lucrative markets for winemakers.The maiden, three-day "Ultimate Parker in Asia" event, which opens on May 1, is hosted by Singapore and London-based wine brokers and stockists Hermitage and will feature more than 250 vintages from 92 Old and New World wineries, including Dom Perignon, Chateau Angelus, Chateau Lascombes and Penfolds.