well, you must of course have a valid argument. try contacting a local politician with the idea. if you manage to convince, say, the mayor, he/she may create a holiday just for that particular city/town. Then, try getting that day in said city/town national media attention. if the majority of the national population favors the idea, a national politician may create it to gain favoritism. hope this helps, and i look forward to seeing your holiday!
For a day and time to be declared a national holiday, it must have been properly defined by the law and is usually a day of rest. Independent nations and territories honor holidays in line with the events of significance to their history. They vary from state to state and may differ by year. They are generally days of celebration.