Convention, Tournament, Event
noun, の adjective
When you have a big meet there's a lot of people together. Why would you have a bunch of people gather together? Probably for a convention or some kind of tournament or event.
たいかい
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 大 has two on'yomi readings, here's a mnemonic to help you remember which one to use: Did you know that Japan has entire conventions on tie kayaking (たいかい)? They regularly hold tournaments where they go kayaking using nothing but ties! Sounds pretty exhausting...
六日は、サッカーの大会です。
The soccer tournament is on the 6th.
毎年、花火大会では、アイスクリームとホットドッグが人気です。
Every year at fireworks festivals, ice cream and hot dogs are popular.
マラソン大会で日本一になったの？すごすぎじゃない？
You were the best in Japan at the marathon? Isn't that amazing?