Watch How I Met Your Mother Season 1 Episode 20 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S1E20 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, and Verizon On Demand.
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Lily and Robin go to a high school prom in order to listen to the band that they want to play Lily's wedding.