Incidentally, they left for their secret retreat a day after Saif"s birthday. According to sources, they were busy with prior commitments in Houston due to Independence Day, after which they had to attend a meet and greet event in Chicago. They reached Chicago late in the evening on August 15 and attended the event with Sharukh and Katrina, after which they had dinner with them. Kareena planned the holiday to surprise Saif, informed sources. The destination is still unknown and they will be back in Mumbai by the end of this week.