I was 2 months into the role (and project) and was given the responsibility of running a client workshop. All I knew about Oil & Gas I'd learned in those 2 months, and this workshop was to dive deep into their technical business processes to identify ways to be more effective.
The two days before the workshop were a mad rush (worked almost a full "normal" workweek in 2 days), and I totally bombed the workshop. I froze. I was trying to manage workshop logistics, client dynamics, difficult content, notetaking, etc. My brain shut down and I literally became a deer in headlights.
I was dead convinced I was going to be yelled at, fired, etc.
What happened? My Project Lead (and Partner) came to the rescue, managed the entire workshop, and got us through.
Long term what happened? Nothing :). I (we) moved on, I got debriefed on what to do better, I learned, I ran workshops later, and noone ever mentioned it again...thank god!