I'm going to answer by biggest in number of players. 2019 WSOP Event #3 The Big 50. This tournament set a record for the largest live tournament ever! There were 28,371 players.
At the beginning of the tournament I felt worried because it was my first time to play at the WSOP and the game was 10-handed (which I had not practiced/studied).
I felt lucky to bag chips on Day 1 because I had to suck out on the river to stay alive. Hero had it all in with a set on the turn with
and beat Villains
turned straight on
SICK RIVER!
I felt blessed to bag chips on Day 2 because I started the day with 14bb and played really well to stay in it. In the first hour action folded to to the Hero in the SB with
where Hero shoved 12bb into the BB who was on tilt and said "I'll gamble with you" with
The
came on the turn to double-up Hero
On Day 3 I was (still am) exited to finish in the top 4.5% and cash. Hero woke up to
UTG with 6bb and shoved. SB big stack woke up to
to knock Hero out with Ace high. Getting to day 3 was really special.
Great experience, great lessons learned!