CBS just released a Press Release for the Episode entitled Desperation Day. And it is Nazanin’s first Episode as the character Nora and it will air Monday Feb 14th, 2011. And here’s a bit about it.

THE GANG SCRAMBLES TO MAKE PLANS FOR VALENTINE’S DAY SO THEY DON’T SPEND IT ALONE, ON “HOW I MET YOUR MOTHER,” MONDAY, FEB. 14
“Desperation Day” – Barney declares February 13th “Desperation Day,” a holiday for desperate women. Meanwhile, Lily surprises Marshall for Valentine’s Day, Ted and Zoey continue to figure out their relationship and Robin bonds with her single girlfriends, on HOW I MET YOUR MOTHER, Monday, Feb. 14 (8:00-8:30 PM, ET/PT)