No, fasting is not a celebration per se, month of Ramadan is holy because of receiving Quran, but keeping fast is a duty upon every healthy and capable Muslim and not a mean of celebration, but a mean of trial of faith. The celebration is actually the fest of Eid Al-Fetr, in which Muslims celebrate their endurance for keeping from sins and desires through the last month. Is lent a celebration/festival? Ramadan is somehow the same story.

Still, I try to keep away from certain desires and I celebrate that on Eid Al-Fetr. Who's there to tell me that I can't celebrate for such accomplishments?