"glasnost meetings" on 5 december became an annual event in moscow. they attracted luminaries such as andrei sakharov, who joined the event on constitution day 1966 after an invitation to gather "five-ten minutes before six p.m. and exactly at six, remove out hats with the others, as a sign of respect for the constitution and to stand in silence, bare-headed, for one minute." the meetings continued until constitution day was moved to 7 october in 1977.