The answer is complicated and I'm so bad at explaining anything. But I'm gonna try to (hold my non-alcoholic beer). Basically, we don't celebrate God (Allah translates to God the Creator in Arabic). There are only two religious events and they mainly exist for two of the obligatory (for those who meet the requirements only) charities (or alms), not as celebrations, and they are considered celebrations for the event of charity that brings happiness to those receiving it and so that those have the ability to do it share that happiness in family gatherings so ultimately everyone is part of it. Confused yet?
There are other events/celebrations in other denominations but I believe the orthodox is what's said above which exists in all other denominations as a common ground.