If you were planning to come into Manhattan tomorrow to find some bargains at the fourth annual Housing Works Bookstore Café “Open Air Book Fair,” be advised: the inclement weather has led the store to move the sale to Sunday afternoon. Now you’ve got some strategizing to do: Come early and catch the first wave of “more than ten thousand books, records and CDs, DVDs and VHS for a dollar a piece”? Or wait until late afternoon, when you can stop inside the store for a group reading by American and Slovenian poets co-sponsored by Ugly Duckling Presse and Literatura magazine?