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Depending on how your organization has defined the TPRM program's scope and bounds, I would think guest speakers would be out of scope for the TPRM program, no?
From a materiality perspective, they would have no access to confidential information or systems, no continuity risk, low compliance risk, etc. The risk profile should then be very low (below materiality threshold). Moreover, the guest speaker would likely not be able to respond to any control assessment questionnaire or provide documentation.