People do meet in real life in Central Denmark, however most social activities for international people occur in Århus, where also locals join in different social or professional groups according to shared interests. Often the events are organized through social media, such as meetup.com, facebook groups or through your work place. Danes celebrate almost everything and quite often alcohol follows along - and there is a good chance your meetings ends with a beer.
The social networks are concentrated in Århus. Internations is for instance helping out expats to organize events, and they are starting to host events in Århus. Another popular way to meet internationals in Århus and local people is through meetup.com organizing different events. Facebook will also be helpful in finding new networks and ways to socialise.
Sources:
Expat Arrivals (Danish section)
Worktrotter
Internations
Meetup