This is the 3726th most frequent Japanese word.
けども
"けども" means "but" or "although," often used to express contrast or concession.
In this sentence, 'けども' is employed to show contradiction between the speaker's busy schedule and the decision to still participate.
忙しいけども、できるだけ参加します。
I'm busy, but I'll participate as much as possible.
The word 'けども' is used to introduce a contrasting condition indicating that the speaker will take action regardless of the rain.
雨が降っているけども、散歩に出かけます。
It's raining, but I'll go for a walk.
Here, 'けども' conveys an opposition or unexpected result between the subject's effort and the outcome.