1. เข้า - to attend (as of a meeting). This word can also be paired with the words "come" ( เข้ามา ) and "go" ( เข้าไป ) and have the same meaning, but I suppose they connote "to come (or go) to an event"; there's also "เข้าประชุม" which is actually "to attend a meeting." Useful.
2. ปลงใจ - to make a decision, make up one's mind.