Knowledge Roll time :3

It may be easier for your chara Pyro since you are from Gallas Tildein (where the tradition of this festival originated)

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Lyrisa: 4 + 15 = 19
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Lyrisa without a doubt yes. You know what it is. 

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Fiore: 2 + 4 = 6
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Fiore does not know since he is not from a place that has this festival as common practice. 

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Leifr: 13 + 6 = 19
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Leifr has heard of it before and knows that it is a festival thrown mainly in the "Country" (I say the word 'country' loosely here) of Gallastre (not all over Ithelia, which is the world we are in) that celebrates the three moons and night being full all at the same time (which is a very rare event that happens only once every few years). It lasts for an entire week. 

Pyro your chara would know this, and that some people in other places actually view the three moons being full as an ominous sign of bad things to come.