If you have ever played the picture puzzle, where every piece is different and unique and each piece plays an important role in forming the final picture. Once all the pieces are merged as one then there is no seperate existence.
Similarly when i talk about celebrating your existence means you are unique and equally important in the play of this universe. Never compare yourself with anyone. You have a very important role to play in merging into universal oneness. Once merge in to that state then there is no separation. Merging in to that oneness is the true purpose of your birth.
Ignorance is thinking that others are ignorant. Here every one are on their own path and love and respect the universal play.
If you want to see the true celebration of oneness then accept yourself and celebrate your existence with your true natute which is Love, compassion and walking courageously in the path of righteousness. Have faith in yourself and you will definitely merge into that state ( like that final piece of puzzle) which completes the picture of divine oneness.
Blessings