Agudath Israel of America has an annual convention Thanksgiving weekend. It has big-name rabbis and a good number of other speakers, loosely (and sometimes not so loosely) on one theme. The main speeches are Thursday night and Saturday night; a number of people go only for one or both of those nights. It serves also as an official membership meeting for whatever purposes they need that for (electing officers, or whatever). It takes place somewhere in the general vicinity of New York City (i.e., within driving distance). Audiorecordings of all non-Shabas events are available soon after each year's convention from AIA (I think from its Reshet Shiurei Torah / Torah Projects Commission): +1-212-797-9000.
Their annual dinner is in the spring, I think. They also have regional conventions, including, I think, at least a Midwest, a Florida, and a West Coast (or California?).
If they still have an organ, it will doubtless have photos and a summary of the convention afterward. But the JO, I learned from Shalom's answer above, is no longer being published, and Coalition isn't either AFAIK. Is Dos Yiddishe Vort? or Inside Track? If not, doubtless Hamodia will cover the convention.
As for an archive of past conventions, doubtless AIA keeps it, perhaps in its Orthodox Jewish Archives (I think it's called).