If I remove someone from my guest list, what will they able to see?

If you remove refund a free ticket, guests will not be notified. If you refund a paid ticket then guests will receive an email letting them know when they can expect money back in their account. Feather refunds instantly, but https://support.stripe.com/questions/where-is-my-customers-refund can take 5-10 days to process refunds before they appear in the customer’s account.