Shabbos morning: Shacharis for Festivals with Festival Amida (with all Shabbos references). Some say the Yotzros as found in the Machzor, followed by whole Hallel, and we then remove two Sifrei Torah from the Ark. In the first Torah scroll we read Parashas Bo (Shemos 12:21-51) from “Vayikra Moshe, Mish’chu…” until “Tziv’osam” and call seven Aliyos. In the second scroll we call the Maftir. We read in Parashas Pinchas (Bamidbar 28:16-25), “U’Vachodesh Harishon” until “Kol meleches avoda lo sa’asu.” We read the Haftara in Yehoshua (3:5-7; 5:2-15; 6:1; 6:27), Vayomer Yehoshua. In the blessings of the Haftara we mention the Festival and The Sabbath. Being that it is Shabbos we omit Kah Keili, we continue with Yekum Purkan (no Av Harachamim), Ashrei.
Musaf: The Chazzan dons a kittel and intones the half-Kaddish to the special Nusach for Tal. Some have the Gabbai announce Morid HaTal before the silent Shemoneh Esreh and thus Mashiv Haruach Umorid Hagashem is not recited from this day and on. (Others do not announce it before the silent Shemoneh Esreh and thus they stop saying Mashiv Haruach from the Mincha tefilla and on). The chazzan recites the prayer for Tal (dew) in its special nusach. The Chazzan then continues with Kedusha. After Retzeh, we recite Ve’se’arev and the Kohanim duchan (as it is Shabbos, we omit the Ribbono Shel Olam tefilla). We conclude the service as usual.
At Mincha Ashrei u’Vah L’tzion , half kaddish, we remove the Torah from the Ark, we read from Parshas Shmini, we call three aliyos (Kohen, Levi, Yisrael) we say the usual Festival Shemoneh Esreh, with all references to Shabbos (we omit Mashiv Haruach, Sfard say Morid HaTal). After the Readers repetition, (we omit Tzidkoscha) Kaddish Tiskabel, Aleinu and mourner’s kaddish.
Motza’ei Shabbos: Candle lighting is delayed until Shabbos has concluded. It is wise for women who light the candles and have not recited havdala in the Maariv tefilla to recite Boruch Hamavdil bein Kodesh l’kodesh, before they light the candles or do any other necessary labor for Yom Tov. We then bless Le’hadlik ner shel Yom Tov and Shehecheyanu. Some wait as long as 72 minutes after shekiah (N.Y.C. 8:34 p.m. E.D.T.) to light the candles, while others light at the earliest 45 minutes after shekiah (N.Y.C. 8:07 p.m. E.D.T.) At that same time we are allowed to begin cooking preparations for the Seuda of Yom Tov Sheni.
We delay Maariv as well in order to begin [the counting of] Sefiras HaOmer. Otherwise Maariv is the usual Festival text, in the Shemoneh Esreh we add Vatodieinu (Nusach Sefarad and even certain Ashkenaz congregations add whole Hallel at the conclusion of the Shemoneh Esreh). We count the Sefira, preceded by the blessing Al Sefiras HaOmer). At home we repeat the Seder procedure of the previous night (obviously, we do not include any references to Shabbos) we include havdala (yaknehaz – yayyin, kiddush, ner, havdalah, zman) in Kiddush.
Sunday morning: Shacharis of Festivals (Shalosh Regalim). Some say the Yotzros as found in the Machzor. We remove two Sifrei Torah from the Ark, as we recite , the 13 Middos and Ribono Shel Olam the 13 In the first we read in Parashas Emor (Vayikra 22:26-23:44), from “Shor o’ kesev” until “Mo’adei Hashem el Bnei Yisrael” and call five Aliyos. We place both Torah scrolls on the Bima and the Reader recites half-Kaddish. We then call the Maftir to read in the second Sefer in Parashas Pinchas (Bamidbar 28:16-25), from “U’Vachodesh Harishon” until Kol meleches avoda lo sa’asu.” We recite the Haftara (II Kings 23:1-9, 21-25) from “Vayishlach Hamelech” until “Va’yetzav Hamelech” (we delete 12 verses) and conclude with “Lo kam kamohu.” We conclude with Musaf of Festivals in which the Kohanim duchan.