Well, it depends somewhat on your definition of what an Islamic festival is. The two primary holidays are Eid al-Fitr and Eid al-Adha. Of the two Eid al-Fitr is more 'fun'; there is a focus on food and family and friends and a celebration of the end of Ramadan (which is the month where, for the most part, you fast (no eating or drinking or smoking or sex) during daylight hours). Eid al-Adha is the end of the month of the Hajj and it's more a time of reflection and charity than a party.

Depending on where you are in the world the celebrations will be somewhat different but I would say that there is not the same level of pagan symbolism in Eid celebrations as there are in Easter or Christmas.

Why the difference? Well, the primary one would be that Islam uses a (modified) lunar calendar so Eid al-Fitr, for example, occurs on 7/28 this year but will occur on 7/17 next year (give or take, Islamic months are slightly variable as they begin when the new moon is sighted). This makes it difficult to associate an Islamic festival with pagan celebrations that are based on solar observations like the spring equinox or the winter solstice.

If you want to be very broad in your definition of 'Islamic festival' and venture into what I would consider more appropriately termed something like 'Islamic customs', Islam borrows heavily from previous religions and practices. Fasting, animal sacrifice, pilgrimage, charity, genital multilation, dietary prohibitions, etc.. But I do not think that you can point at the celebration of Eid al-Fitr and easily link it to a pagan history of celebration the same way that you can take the trappings of Christmas and compare it to traditional celebrations of the winter solstice, for example.