attend is a regular verb which typically means to go to or be present at an event or other gathering. The verb typically takes an object to denote what the person is attending, such as a meeting, lecture, or party. The verb can also be used in the sense of being in attendance at such an event, meaning being present or involved in it.
1. I am attending the conference tomorrow.
2. She attends the same gym I do.
attend is often used with a prepositional phrase or clause to indicate the time, place, and/or purpose of the event. For example, 'I'm attending the concert tonight' or 'She will be attending the wedding next weekend.' Additionally, the phrasal verb 'attend to' is fairly common, which has a slightly different meaning of to take care of or pay attention to something, such as, 'I need to attend to this problem immediately.'