A method is provided for use in connection with a communication session between two or more participants. The communication session may be an online/web-based meeting, voice call, video call, instant messaging session, etc. Interactions between two or more participants of the communication session are monitored in order to identify an additional participant for the communication session based on a topical context of the interactions. A request is sent to the additional participant to join the communication session. Before the request is sent to the additional participant, the participants in the existing communication session may be notified with a prompt inquiring as to whether the additional participant should be contacted to join the existing communication session.