Over the weekend, an organization in Brooklyn called the Interference Archive gave away about five thousand stickers, three thousand printed posters, a thousand buttons, and almost two gallons of red and black paint that ended up silk-screened onto T-shirts, tote bags, and patches in the form of mottoes like “Don’t Mourn, Organize.” The occasion for the giveaway, Donald J. Trump’s swearing-in as President this week, was viewed with gloom by many who showed up on Saturday and Sunday.