The proposed amendment likely won't finally pass until 2023.
Women make up approximately 51% of the state population, but just under 29% of the state Legislature. Several groups are working to change that.
The Capitol building will reopen on Monday.
The special election is the fourth to be scheduled for May 18.
Blake's resignation will lead to a special election in the district he has represented for a decade.
Gov. Tom Wolf will propose a sweeping new plan to dramatically boost funding for public schools, to be supported by an increase in the state's personal income tax rate.
Gov. Tom Wolf will move his annual budget address to Wednesday, amid a snowstorm that was prompting restrictions on highways across Pennsylvania.