We will/would also promote ABC Business during our event.

Do I use will or would in the above sentence?

4 answers

Depends on how certain you are.

http://home.comcast.net/~garbl/stylemanual/vthruz.htm
see will/would
i am pretty certain.
So it's not about the tenses? present or past?
No, it is not about tenses at all. It is about certain or conditional action. Look at that site.
The word "will" says that the action is going to be done in the future. No doubt about it.

The word "would" says that the action might be done in the future -- possibility, but not a certainty.