Arriving the night of Sunday, May 28, 1989, we were immediately whisked to a huge arena where a concert was celebrating the 30th anniversary of the Beatles. Here is the poster from the concert (click to magnify):

It's a calendar for 1990; the calendar part is in Russian. Here is a detail (click to enlarge):

You can see the days of the week and the notations in handwriting. This one indicates George Harrison's birthday (день рождения Джорджа), February 25, 1943.