Police have said that at least 10 demonstrations were planned to protest US and Russian presidents Donald Trump and Vladimir Putin as they meet in Helsinki for bilateral talks on Monday 16 July.
The largest of the protests is expected to be the Helsinki Calling demonstration, which begins at 1.00pm on Sunday and will proceed from Kaisaniemi Park to Senate Square in downtown Helsinki.
The demonstrators will include representatives from up to 100 grassroots organisations and will feature speakers such as writer Sofi Oksanen, entrepreneur Peter Vesterbacka and Europarliamentarian Heidi Hautala.
The umbrella group organising the protest said that it is demonstrating in support of human rights and democracy.
On Sunday the youth arm of the nationalistic Finns Party will also organise a Welcome Trump event at Narinkkatori, starting from 1.30pm.