Check the consulate's website for closures. Sometimes they are closed for Nigerian holidays so search the internet for Nigerian holidays. They close on American and Nigerian holidays and Boxing Day which is a British Holiday. If it falls on Saturday or Sunday, you can be sure they are closed on the following Monday. This is what happened on the 28th of Dec 2020. Christmas was on Friday, Boxing day on Saturday, they were closed on Monday the 28th of December 2020.
The consulate will be closed from 15th - 31st January 2021 due to COVID. Confirm from their website https://nigeria-consulate-atl.org/public-notice-7/
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