With the article emphasizes the meal as a significant event in and of itself, so you'll see I hosted a dinner for twelve or I am going to a dinner to benefit the homeless . Without the article emphasizes the meal in its aspect as a relatively intimate, private, possibly social occasion, so you see things like I invited some friends over for dinner or I eat dinner every night at seven sharp . It's surprisingly difficult to explain the distinction I mean to make in a clear and concise way, so if you have further questions or need examples, please ask.
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