Today Vappu starts with Mantan Lakitus when the Hagis Amanda statue at Kauppatori gets her vappu cap. At 18:00 a group of students will lower the white cap onto the statue as the opening of the Vappu celebration.
You should definitely come there and see this spectacle that gathers a huge audience every year. Who ever has one brings their own white cap to the celebration to put it on and wave it at the time when Hagis Amanda gets hers.
Remember to be there early (at least 30 min) if you want to get a good spot. And maybe bring an umbrella with you. The weather might not be as good as last week.