Next to the permanent exhibitions, till the end of 2000 there have been organised about 200 temporary exhibitions, thanks to which the citizens could get to know with the collections of the Museum in Ostrołęka and with collections gathered by other polish museums. These exhibitions were of a wide interest. At the exhibitions there were found information about the local history, happens of the culture from this region and the country itself, e.g.: Commanders of the January uprising on Kurpiowszczyzna (1983), By the uprisings to the independence (1988), Ostrołęka and its citizens in the old photography (1955), Order of Honorary Legion (1997), Nobility and its abodes in the neighbourhoods of Ostrołęka (1988).

More than 50 exhibitions referred to ethnography, presenting most of the spheres of a traditional, village culture, as well as folk art e.g. Folk dress and weaving of Ostrołęka's province, Folk-boxes (1976), Kurpiowski folk embroidery (1979), Traditional kurpiowskie dishes under the motto "Nie zierz gambzie, aż położys na zambzie" (1989), Paper cut-out from the White and Green Forest (1993), Folk toy on Kurpie (1995), Former sculpture on Kurpie (1996) and many others.

There were also made accessible exotic exhibitions, most often from the collections of the State Ethnographical Museum in Warsaw, illustrating distant cultures of other continents e.g. from India, Egypt, Mongolia, Indonesia or North America.
The museum runs educational activity in the range of organising lessons and museum-workshops, addressed mainly to children and teenagers.

It coorganizes also folk events:

• Palm Sunday in Łyse
• Kurpiowskie Wedding in Kadzidło
• Honey harvesting in Myszyniec