"I take atheists at their word, and the word is, they have an absence of a belief. Naturally, I ask, -- how do you celebrate that? I am collecting proposals...
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It's a non-question. What to celebrate? I don't celebrate the lack of something. That would be completely illogical. My monuments are society's monuments. My monuments memorialize human achievements. It's simple.
By all means, if you have nothing to celebrate, don't. Like I said, a monument to atheism is absence of a monument. If, on the other hand you wish to share your celebrations with the theists, do come in.