Don't have live event option on teams

There are actually a few licensing requirements. You will need either E1, E3, E5 or if in EDU A3 or A5. https://docs.microsoft.com/en-us/MicrosoftTeams/teams-live-events/plan-for-teams-live-events#:~:text=The%20following%20prerequisites%20are%20required%20for%20the%20user,an%20Office%20365%20Education%20A3%20or%20A5%20license. Assuming you have the correct licensing, you may not have Live Events enabled in your Live Events Policy. If you aren't the admin, I would check with your Teams Administrator.