Trainees ought to endeavor to observe proper etiquette at all times.
It is proper to bow when entering and leaving the dojo, and when coming onto and leaving the mat. The only way to advance in aikido is through regular and continued training. Attendance is not mandatory, but keep in mind that in order to improve in aikido, one probably needs to practice at least twice a week. Your training is your own responsibility. No one is going to take you by the hand and lead you to proficiency in aikido.