as it is right now with the event still not being cancelled, im personally leaning towards cancellation of the event not happening as of right now since currently there doesnt seem to be a push for further regulations
HOWEVER
i did do some digging on the danish ministry of foreign affairs website in regards to regulations upon entering the country
https://en.coronasmitte.dk/travel-rules <- website found here if you wanna look for yourself, alternatively your own countries embassy in denmark/ministry of foreign affairs probably has info aswell, i would highly recommend checking both sides
as it stands right now, a negative test is required when entering denmark from both the schengen area and oecd countries however, if you are not vaccinated and are travelling from a country not in the schengen area (ie. the uk) you will have to isolate for 10 days
this is of course what the rules are right now, and they will probably change before april, but as it stands right now i dont see them changing too much
tldr: get vaccinated, get tested, preferably pcr, before you go to denmark and make sure to check for any regulations when returning home as well