Some say st. patrick's day is the luckiest day of the year to do what?

St. Patrick's Day is one of the luckiest days to get married however it is not possible always to get married on the luckiest day

Explanation:

The day is considered as the most hopeful day because it is termed as one of the funny beliefs within the Irish community. However, if this day falls on a Saturday, then it will not be a lucky day anymore to marry. This is also one of the marriage superstitions in Ireland that states that Saturday is not a lucky day.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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