I know we had a presentation on architectural photography last year, but I can't remember the speaker's name. How can I look it up?
On the top right of this page (well, every page!) there is a search box. You can search for a partial match; for example if you enter "Archi", you'll get the hits for Archictecture, Architectural, and Archive. The search is not case sensitive. The results will show you the original event announcement for the presentation.
Or, if you prefer to look things up by date, click the Events tab at the top of this page. On the Events page, scroll all the way to the bottom. You'll find the original event announcements going back several years.