Teams supports both the options. Your choice depends upon the number of attendees and type of interaction. Use Teams Meeting - If attendees need to interact with presenters and share chat, audio, video, etc. then Teams meeting is better. The capacity of the Teams meeting as of now is 300 but check the latest documentation to find the current limit. Use Live Event - If there is one-way interaction - like a keynote, inaugural speech, CEO's address to all employees, guest speaker covering key topics and so on. Here we need more than 300 attendees, but the interaction is limited to Q&A. The current limit is 20000 users. Large conference needs both Meetings and Live events Typically a conference has few keynote sessions and many breakout sessions. Therefore, you can use both these modalities. Make sure that you manage the invitation links carefully.