I wanted to make a one-day trip to Maastricht tomorrow, but it's Ascension day. Are shops and cafes opened during this holiday?
According to the tourist association
Tijdens Hemelvaartsdag (29 mei 2014) zijn de winkels in het centrum geopend van 12.00 tot 17.00/18.00 uur.
In English it reads that the shops in the city centre are open from 12:00-17:00/18:00. The 1st of June the shops will be closed. For cafes I would be highly surprised if they are closed, so I assume they will be open as well.