The Critical Eye will be going a bit cross-eyed this week, as we need to focus on two different yet excellent arts opportunities: Next Saturday, singer, dancer and actress Jill Keating will be performing a one-woman show at Webb’s Captain’s Table, in Mayville. Meanwhile, Buffalo’s Albright-Knox Gallery has announced a major change in their opening hours, and has introduced an internationally-celebrated show, which will be running for the rest of 2009 and into January. If we concentrate hard, I think we can focus on them both. SHIRLEY VALENTINE British playwright Willy Russell has created his play ‘‘Shirley Valentine,’’ as what he calls his gift to anyone who has every looked around and wondered what has happened to his or her life. The play was a smash in both London and New York City, and was expanded into a feature film. It won a number of major awards, including the Laurence Olivier Award for best new comedy of 198.