You should definitely join the Telegram chat of the event. To avoid bot spam, we don't post the direct link here, but you can find the channel by searching @graffathon in Telegram. You can also join on irc at #graffathon@IRCnet, which is linked to the Telegram chat.
The chat is the main communication channel during the event and is also the quickest way to contact the organizers. Don't hesitate to also ask for help with programming or anything else!