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1 vs100 on Xbox Live is normally reserved for Xbox Live Gold subscribers only. This weekend, July 17-19, the game will be free for everyone; meaning Silver members can join in on the fun.
According to Xbox.com, this weekend will again feature real world prizes which means this will be those with a Silver Subscription's first chance to win actually goodies:
This coming weekend, 17-19 July, marks the launch of Skill Prizing in “1 vs. 100 (beta) Season 1”. Skill Prizes that include digital cameras, holiday vouchers, laptop PCs and HD TVs are being awarded to the most outstanding players.