Call the biggest one this week, One against your thought-partner (A Certain Mr. Chavez), a "Sign of dissent" in the headline.
Make the picture of the MASSIVE crowd, small. Like this!
(Don't forget to mention Cavez wins elections by wide margins) Yeah... Dictators do that!
Now, When you want to report "protests", but not many people show up, you do Close-ups, Like these, of perrenial favourite Bush-ally-tyrant-Musharraf protesters.
Or just report on the "Protest", with no pictures at ALL of the actual event. Just a blow-up doll of your hero.