Its soon time for Kattinge 2017!!!
Here is some info on how to get there by public transport.
From Copenhagen you will take a train to Roskilde. A lot of trains go through Roskilde so they leave often.
From Roskilde Station you will take bus 207. The bus stops right at Kattinge Værk. It takes about 15-20 minutes from Roskilde. 207 leaves 2 times pr hour (two minutes and 32 minutes past the hour) until 17:32. Then only 32 min. past the hour until last bus at 22:32.