The demonstration will possibly be held on September 18.
This comes after the government proposed measures to improve cost-competiveness which entails reducing Sunday pay, changing Epiphany and Ascension Day to unpaid holidays, among others.
The government announced on Tuesday that it plans to implement the changes through legislative amendment at the end of the current collective bargaining agreements.
Trade unions have described the government measures as a move tantamount to unilateral scuppering of the Finnish culture of contract, among other things.
Some of the trade unions on Wednesday expressed the hope that a new social contract negotiations would start following the government announcement of legislative plans. But Prime Minister Juhä Sipilä made it clear on Thursday that negotiations will not be initiated.
