Virtual Teams event - 5000 attendees

Hi all, 

I am planning a Teams event soon with around 5000 attendees. Does anyone have any top tips/best practice for a smooth running live event? 

Do I need to be cautious of any bandwidth/delay issues with such a large number of attendees? 

Do I have to run it as Teams live or would a meeting still work? 

Any Issues using Sli.do and sharing screen with this number of people? 

Have people experienced glitches when running events with that many people on Teams?