The 1960s marked the beginning of an "Events Era" in Central Park that reflected the widespread cultural and political trends of the period.[193] The Public Theater's annual Shakespeare in the Park festival was settled in the Delacorte Theater,[194] and summer performances were instituted on the Sheep Meadow and the Great Lawn by the New York Philharmonic Orchestra and the Metropolitan Opera.[195] During the late 1960s, the park became the venue for rallies and cultural events such as the "love-ins" and "be-ins" of the period.[196] The same year, Lasker Rink opened in the northern part of the park; the facility served as an ice rink in winter and Central Park's only swimming pool in summer.[197]