Close to Baarlo there are several hotels you could stay during ProgPower Europe.
The city of Venlo
If you like to visit a few pubs after the festival days, we recommend you to stay in Venlo. If you like it more quiet, you can check out the hotels in other villages around Baarlo.
More info
The best is to use google to find some good hotel, bed & breakfast, group accommodation. Or try Booking.com or Expedia.