Described herein is a system configured to determine when burst activity (e.g., an activity hotspot) occurs in a conference session, and to associate the burst activity with a speaker that is speaking at a time when the burst activity occurs. Burst activity occurs when a threshold number of notable events (e.g., five, ten, fifty, one hundred, one thousand, etc.) occur within a threshold time period (e.g., ten seconds, thirty seconds, one minute, etc.). In various examples, the thresholds can be established relative to a number of participants in a conference session and/or a duration of a conference session (e.g., a scheduled duration). The system can then communicate data indicating that a threshold number of events occurred while an individual speaker is speaking.