The Curation Body made a negative review of your Website petition given it’s a request for an event that happened in 2021.
For past events you could use using mint links or POAP.Delivery (in case you have collected the ETH addresses from the attendees).
As I can see, your petition for mint links has received a positive review so you can send the mint links to the hackathon participants.
For your future events Please consider taking a look at the POAP Distribution methods article or chatting with the POAP Customer Support team via the chat bubble.
Looking forward to reviewing more of your petitions in the near future!