Music fan Alex Milsom tells BBC Newsbeat the festival did warn that rain was forecast, but says there was a lack of communication during the day.
“I had absolutely no idea what was going on in the middle of the festival,” the 28-year-old from London says.
“There were rumours left, right and centre.
“It’s proof that when you don’t know what’s going on, you breed disinformation because group chats and messages and Instagram comments were the only way I was finding out what was going on.”
Milsom says he only learnt about Doja Cat being cancelled through her going live on Instagram, where she told her fans she was “absolutely crushed” that she could not perform.
He says that fans were getting notifications on the app saying ‘programme update’ but with no further explanation.
Milsom, who works in communications, said the handling of the first day has put a “dampener” on the event, especially for fans who have “saved up for months”.
“The least they could do is plan for the rain that they knew was coming four days ago.”