Here are the answers to your questions:
-
Which country has a national Ceviche Day?
Perú -
Which is the main meal in most Spanish-speaking countries?
Lunch -
Cierto o falso: It is polite to say "Qué asco!" if something is unappealing to you during mealtime in Spanish-speaking countries.
Falso
Let me know if you have any further questions!