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until, available, reply, preparation, look forward to

    Yesterday I heard from a friend. In his letter, he said,“I'm planning a housewarming party and I've already started making  for it. It will start at 2 pm next Tuesday and last(持续)  9 pm. I hope you can come if possible.I am  your coming.” But I am busy preparing for an important meeting these days. I have to turn it down. So I  in writing to the invitation like this, “I'm glad that you invited me. It's such a big event that I don't want to miss(错过) it. But I really have an important meeting that day, so I won't be . I'm very sorry. I'll visit you another time.”