It would depend on which address by President Kennedy is being referred to, as he gave many speeches during his presidency. However, if the question is referring to his most famous address, which was his inaugural address on January 20, 1961, then immediately after his speech, he took the oath of office and officially became the 35th President of the United States. Following this, he delivered a shorter address, which included his famous line: "And so, my fellow Americans: ask not what your country can do for you - ask what you can do for your country." After the address, President Kennedy attended the inaugural parade and then various inaugural balls that evening.