In Islam, we are allowed to work to earn livelihood for us and our family all around the year. We are not like some communities who think that working in certain days is not allowed.
Working on the day of Eid, every Eid including Eid-ul-Fitr, Eidul Adha, Eid al-Ghadeer which is greatest Eid in Islam is permitted and the money earned is allowed. Even working on Friday is allowed except when the call for Friday Prayer is declared, we have to leave trade and business and go to join the Friday Prayer. Working on Friday before and after Friday Prayers is allowed.
It is Makrouh (Disliked) to work on Ashura being the day of the greatest tragedy in Islam, and we know that Makrouh is disliked but not Haraam.