...
Letter writing - organize a letter writing party with your members, and write letters to a Congressional committee or your own Members of Congress focused on one issue.
Committee calls - organize a calling event to call Democratic Senators regarding Trump's cabinet picks.
...
Banner party - before your march, meet with your members (and children) to create banners for the march.
January 21 March with Washington - many countries around the world are planning marches to coincide with the march Women's March on Washington. This is a great way to garner press and motivate your membership. Remember to read the guidelines first!