Tonight's conversation will be partly conceptual and partly historical.
Conceptually, we will consider the possibility that many traditional philosophical debates are really disguised debates about human psychology - one implication being that empirical psychologists are in a better position than "armchair" philosophers to participate in such discussions. (The contemporary movement of experimental philosophy constitutes one relevant contact-point.)
Historically, we will refer to the classical "psychologism dispute" that took place in the late nineteenth and early twentieth centuries. The relevant SEP article (link), which attendees are encouraged but certainly not required to read in advance, engagingly contextualizes our topic amid the variety of thinkers and projects that laid the foundations for today's philosophical scene - analytic, continental, and otherwise.