As the convocation of heads of governments and permanent Commonwealth staff and experts , CHOGMs are the highest institution of action in the Commonwealth , and rare occasions on which Commonwealth leaders all come together . CHOGMs have been the venues of many of the Commonwealth 's most dramatic events . Robert Mugabe announced Zimbabwe 's immediate withdrawal from the Commonwealth at the 2003 CHOGM , and Nigeria 's execution of Ken Saro-Wiwa and eight others on the first day of the 1995 CHOGM led to that country 's suspension
2003 CHOGM
Commonwealth Heads of Government Meeting 2003
Commonwealth Heads of Government Meeting