The calorie calculations for anything that you didn't make yourself or aren't prepackaged are also going to be wildly inaccurate. It's impossible to know how much oil went into things, how much sugar, etc. It's great that you came up with a figure, though - I used to just say "eh, this day was blown" when maybe it wasn't that bad (as yours wasn't, imo).
That said, was this potluck a planned thing, or a surprise? Don't beat yourself up about the past, but think about how you might plan around these events in the future.
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