The calendar's arrangement, at least for America. I think would be better if we had 13 months, having 12 of them with exactly 30 days in their block. The 13th month has all the extra days, and is extended during a leap year. Coincidentally, elections for president should be held during the leap year, to give people an longer voting window.
During the voting window each year, the last five days of December, all the days in the 13th month, and the first 5 days of January, are eligible as vacation days. Voters pick five days during the 15 day voting window to be on paid vacation. If they fail to vote and have a job, their employer will be penalized with an amount of money that is double the pay of the worker for five days of work. Citizens, if they vote, get a $100 check from the government.
This creates a carrot for everyday people to vote, especially workers. Employers are punished if they try to interfere with voting and vacation days during the voting season, which in turn makes it easier for people to participate in democracy. The vacation days allow for research, to have ample time to send a ballot or go to the booth.
Also, I personally dislike the regular months having variable lengths. It is disorderly and annoying, to have them stretch and bend seemingly at random.