If I want to say, "Among the events written on the website, I can only come to the event on thursday," is this correct?
サイトに書いてあるイベントの中で、木曜日のイベントしか来られません。
It sounds correct to me.
But I'd say サイトに書いてあるイベントの中では、木曜日のイベントしか来られません。
It sounds more like the speaker is going to make a choice among the events. I can't explain why. But since I'm a native Japanese speaker, I don't think it's totally wrong.