I don't believe there are any tools here on Bungie.net that will tell you which bosses you have left to hit, and I also don't think anyone in the community has created such a tool yet either. It certainly sounds like it would come in handy.
Unfortunately, it sounds like you'll just have to keep hitting each boss until you complete it.
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Yer it really sucks to get a full team together just to find out its not the week i need... :/
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That does suck, hopefully someone creates something soon.