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We don't say Tachanun on Lisa's birthday. It's also a quasi festival and we are commanded to have 2 meals and are forbidden to fast. If we have good meals on 9 Tishrei, it says it's as if we fasted both days (9 and 10 Tishrei).
I don't understand...
Tishrei 9 – The day before Yom Kippur1 (but not the minchah of the day beforehand).Tishrei 11-14 – The days between Yom Kippur and Sukkot.2Tishrei 24-29 – From after Simchat Torah until the conclusion of the month.3Kislev 10 (Chabad custom)4Kislev 19-20 (Chabad custom)5Shevat 15 – Tu b'Shevat.Adar 15 – Shushan PurimAdar I 14-15 – Purim Katan and Shushan Purim Katan.6Nissan – The entire month.7Iyar 14 – Pesach Sheni (but not the minchah of the day beforehand).Iyar 18 – Lag b'Omer.Sivan 1-5 – The beginning of the month until Shavuot.8Sivan 8-129Tammuz 12-13 (Chabad custom)10Av 9 – Tishah b'Av.11Av 15 – Tu b'Av.29 Elul – The day before Rosh Hashanah (but not the minchah of the day beforehand).12
During the intermediate days (Chol HaMoed) between Yom Kippur and Sukkot (which starts Wednesday night)...http://www.askmoses.com/en/article/287,82943/On-which-days-of-the-year-is-Tachanun-omitted-from-the-prayers.html
The days between Yom Kippur and Sukkot are not Chol HaMoed. Chol HaMoed are actual festivals with Musaf. Chol HaMoed only refers to the days of Passover and Sukkot that are not Yom Tov. In Israel that are Days 2-6 (For Passover) and 2-7 (For Sukkot). Outside of Israel, it starts on Day 3. These days between Yom Kippur and Sukkot are just regular days with no Tachanun like the whole month of Nissan and the rest of Tishrei after Simchat Torah. The days after Shavuot are different because up to the 12th of Sivan, people could bring their Chagigah offering since Shavuot itself is only one day. Some also don't say Tachanun on the 13th outside of Isarel because of Sfeika D'Yoma. Also, the First Temple inauguration was held for 7 days from before Yom Kippur to Sukkot and people actually were forbidden to fast on Yom Kippur that year. The Mishkan was inaguaarted in Nissan from Rosh Chodesh to 12 Nissan. So now can correspond to the period of Nissan before Passover (Also exactly 6 months apart.).