Please supply more information here about what you do.
I may know some people who can help you, but I would need to have more details.
What time of year are you talking about?
Where in Denmark?
Are they acoustic venues?
Are they stage concerts you organise or are they informal sessions?
How much money is paid to the musicians?
What transport arrangements are made?
How many people are you looking for?
What combinations of instruments are you looking for? Is is traditional music you are looking for?

Put your answers on this thread please.
Thank you.