The Irish Oak is a Chicago bar located near Wrigley Field that offers multiple private event spaces and packages. They have three private spaces available - the Corner Window Nook seating 15-30 guests, the Still Room seating 50-75 guests or up to 120 guests seated, and the option to rent the entire bar for over 150 guests. The document provides details on beverage and food packages available and notes the event coordinator, Vincent Murphy, can be contacted for personalized package options.