Capitalization of "guest of honor"

In the following sentence, should guest of honour be capitalized?

Ms. Joe Doe (DTM), the District Governor of Toastmasters International was the Guest of Honour during the charter party on March 23, 2008.

It looks a bit weird to me, and I am trying to find something that will support writing it (or not) this way.

Solution 1:

If you're talking about guests of honor in general, it definitely should be lowercase. However, as in your example, if you are talking about a specific guest of honor on a specific occasion, it could count as what Wikipedia calls a specific designator, so grammatically either way should be acceptable. However, looking at Ngrams to determine usage, it generally seems not to be capitalized.