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| 1820 |
| June 16 | A statute provides for a referendum on the question of a convention to revise the constitution and for the election of delegates if a majority of the voters approve. |
| August 21 | In town meetings the people endorse a convention; the vote is 11,756 to 6,593. |
| October 16 | The convention delegates are elected in town meetings. |
| November 15 | The convention opens in Boston. |
| November 24 | The delegates commence debate in committee of the whole on the reports submitted by the select committees. |
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| 1821 |
| January 1 | The convention begins consideration of amendments reported by the committee of the whole. |
| January 2 | The convention approves, 245 to 147, the revised plan—the eighth resolution of the legislative committee—for the apportionment of representatives. |
| January 6 | The convention rejects, 136 to 246, Childs’s substitute amendment for the third and fourth articles of the bill of rights. |
| January 8 | The convention takes up the report of the committee appointed to reduce the approved amendments to form. |
| January 9 | The convention gives final approval to fourteen amendments and to an “Address to the People” and adjourns sine die. |
| April 9 | Nine of the fourteen amendments are ratified by the people in town meetings. |
