"attend to"

I would like to know that in what cases do I need to use “to” preposition after the word “attend”

I know, when I want to express I am a studend of university, I just say I attend University

But what about that if I want to say, I attend (to) an event, or I attend to exchibition, does it need to use any prepositions after attend at all?

It still causes a bunch of problems to me how and when to use prepositions, and I often make mistakes in spoken English though I’ve learnt English for 15 years. :S

‘Attend to’ is used to mean ‘care for’, i.e. I’m attending to my friend; she just twisted her ankle.

As far as I can tell, ‘attend to’ isn’t really a phrase commonly used in, say, informal speech or writing. Just a heads-up.

If you mean taking part in, you don’t need to use To after Attend. For example, I’ve attended many classes.

You use attend + to if you are talking about taking care of/looking after/sorting out something rather than talking about taking part in something.

“I attend lectures every Tuesday morning.” - taking part in, so no ‘to’

“I attend to the paperwork promptly.” - sorting out, 'to is required.

“I attended meetings every night last week.”
“I attended to the injured man.”

Thank you for all replies