An INternational Day for suicide prevention would be a good idea. As would an international event reminding men to take care of their health. I have recently been to a few events where there were stands raising awareness of testicular cancer and encouraging men to examine their bollocks for potential problems.
All that's all good.
But men-as-a-class oppress women-as-a-class. There are no societies or cultures in this world in which men have fewer rights than women, are legally owned by women, are routinely bought and sold by women, killed by women with comparative impunity. There are countries, cultures and societies where women are forbidden to vote, drive, own property, go out unaccompanied etc.
So feminism, the liberation of women,remains an important movement. By all means set up or support campaigns to assist specific male issues, men's mental or physical health problems, etc. Or set up campaigns to help specific categories of people such as wheelchair users, refugees, ex-forces, cancer sufferers. Or support animal charities if that's where your priorities lie.
Many individual feminists are involved in other kinds of activism or charity work, just as many people who campaign and fundraise for animal welfare, prison education, curing cancer, etc, support feminist causes.
But feminism is about women. It doesn't need to be diluted or distracted by all the other valid causes that any and all individuals can involve themselves with. Feminism is for women.