Trip to Jujuy

I have a son and he and his family that are living in Jujuy. I didn't think that I'd ("I would) won't see them until December 29th because on that date they're coming to my house to spend the New Year's Eve party (or " ...to have a New's Year's Eve Party.") But I miss them too much so I bought a ticket and I'm going to Jujuy for a week in November.

I'm waiting that come for that day to come.

Trip to Jujuy

I have a My son and his family that are living live in Jujuy. I thought that I won't wouldn't see them until December 29th because in this date they'll come to my house to spend New Year's. But I missed* them too much, so I bought a ticket and I'll go to Jujuy for a week in November.

I'm waiting for that come that day day to come.

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*Since you used "thought" in the past tense initially, you want to keep it in the past. That's why "missed" is in the past tense, to keep it consistent. Same with "bought".