Well, which version of the Legendarium are we talking about? Galdor of
Gondolin only appears in the Book of Lost
Tales, but in that early version of the Legendarium, the
Dagor Bragollach and the
War of Wrath did not exist. So I assume you're talking about the later, post-LotR era Silmarillion, and assuming that the twelve houses of Gondolin and their lords still exist, although unmentioned, in that version (which is, I think, a pretty reasonable assumption).
We're not told, as far as I know, of any participation by the Gondolindrim in the Dagor Bragollach. I suppose it's possible that a few
Elves from Gondolin might have left the
city and come to the aid of their allies in Dorthonion and Dor-lomin, but if so, it escaped the notice of the chroniclers. It doesn't seem very likely to me, though -
Turgon was so committed to the isolationism of Gondolin that his participation in the Nirnaeth was a complete surprise, and it doesn't seem terribly likely that any of the lords of the city would oppose him in this.
We know, on the other hand, that the Gondolindrim did fight in the
Nirnaeth Arnoediad, and it seems likely that all, or nearly all, of the lords of the houses would have been there.
As for the War of Wrath - well, the original "Tale of the
Fall of Gondolin" does have Galdor survive and escape with
Tuor and the other refugees. Assuming that this persists in the later Silmarillion version, then it is possible that Galdor could have fought in the War of Wrath. If I recall, the 1930s Silmarillion texts suggest that only
Men, not
Noldor, fought alongside the host of the
Valar in the Great Battle. However, the "Concerning 'The Hoard'" letter makes mention of Men and Elves joining them. So I think the verdict is that it's possible Galdor participated, but we have no evidence that it actually happened.
My answer to the question, then, is: Bragollach? No. Nirnaeth? Yes. War of Wrath? No way to know. Seeing as your poll is phrased with an "and" rather than an "or", my answer is "No."
