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Yitzchak's 2nd Birthday Party

וַיִּגְדַּ֥ל הַיֶּ֖לֶד וַיִּגָּמַ֑ל וַיַּ֤עַשׂ אַבְרָהָם֙ מִשְׁתֶּ֣ה גָד֔וֹל בְּי֖וֹם הִגָּמֵ֥ל אֶת־יִצְחָֽק׃ וַתֵּ֨רֶא שָׂרָ֜ה אֶֽת־בֶּן־הָגָ֧ר הַמִּצְרִ֛ית אֲשֶׁר־יָלְדָ֥ה לְאַבְרָהָ֖ם מְצַחֵֽק׃ וַתֹּ֙אמֶר֙ לְאַבְרָהָ֔ם גָּרֵ֛שׁ הָאָמָ֥ה הַזֹּ֖את וְאֶת־בְּנָ֑הּ כִּ֣י לֹ֤א יִירַשׁ֙ בֶּן־הָאָמָ֣ה הַזֹּ֔את עִם־בְּנִ֖י עִם־יִצְחָֽק׃ וַיֵּ֧רַע הַדָּבָ֛ר מְאֹ֖ד בְּעֵינֵ֣י אַבְרָהָ֑ם עַ֖ל אוֹדֹ֥ת בְּנֽוֹ׃ וַיֹּ֨אמֶר אֱלֹהִ֜ים אֶל־אַבְרָהָ֗ם אַל־יֵרַ֤ע בְּעֵינֶ֙יךָ֙ עַל־הַנַּ֣עַר וְעַל־אֲמָתֶ֔ךָ כֹּל֩ אֲשֶׁ֨ר תֹּאמַ֥ר אֵלֶ֛יךָ שָׂרָ֖ה שְׁמַ֣ע בְּקֹלָ֑הּ כִּ֣י בְיִצְחָ֔ק יִקָּרֵ֥א לְךָ֖ זָֽרַע׃ וְגַ֥ם אֶת־בֶּן־הָאָמָ֖ה לְג֣וֹי אֲשִׂימֶ֑נּוּ כִּ֥י זַרְעֲךָ֖ הֽוּא׃ וַיַּשְׁכֵּ֣ם אַבְרָהָ֣ם ׀ בַּבֹּ֡קֶר וַיִּֽקַּֽח־לֶ֩חֶם֩ וְחֵ֨מַת מַ֜יִם וַיִּתֵּ֣ן אֶל־הָ֠גָ֠ר שָׂ֧ם עַל־שִׁכְמָ֛הּ וְאֶת־הַיֶּ֖לֶד וַֽיְשַׁלְּחֶ֑הָ וַתֵּ֣לֶךְ וַתֵּ֔תַע בְּמִדְבַּ֖ר בְּאֵ֥ר שָֽׁבַע׃ וַיִּכְל֥וּ הַמַּ֖יִם מִן־הַחֵ֑מֶת וַתַּשְׁלֵ֣ךְ אֶת־הַיֶּ֔לֶד תַּ֖חַת אַחַ֥ד הַשִּׂיחִֽם׃ וַתֵּ֩לֶךְ֩ וַתֵּ֨שֶׁב לָ֜הּ מִנֶּ֗גֶד הַרְחֵק֙ כִּמְטַחֲוֵ֣י קֶ֔שֶׁת כִּ֣י אָֽמְרָ֔ה אַל־אֶרְאֶ֖ה בְּמ֣וֹת הַיָּ֑לֶד וַתֵּ֣שֶׁב מִנֶּ֔גֶד וַתִּשָּׂ֥א אֶת־קֹלָ֖הּ וַתֵּֽבְךְּ׃ וַיִּשְׁמַ֣ע אֱלֹהִים֮ אֶת־ק֣וֹל הַנַּ֒עַר֒ וַיִּקְרָא֩ מַלְאַ֨ךְ אֱלֹהִ֤ים ׀ אֶל־הָגָר֙ מִן־הַשָּׁמַ֔יִם וַיֹּ֥אמֶר לָ֖הּ מַה־לָּ֣ךְ הָגָ֑ר אַל־תִּ֣ירְאִ֔י כִּֽי־שָׁמַ֧ע אֱלֹהִ֛ים אֶל־ק֥וֹל הַנַּ֖עַר בַּאֲשֶׁ֥ר הוּא־שָֽׁם׃

The child grew up and was weaned, and Abraham held a great feast on the day that Isaac was weaned. Sarah saw the son whom Hagar the Egyptian had borne to Abraham playing. She said to Abraham, “Cast out that slave-woman and her son, for the son of that slave shall not share in the inheritance with my son Isaac.” The matter distressed Abraham greatly, for it concerned a son of his. But God said to Abraham, “Do not be distressed over the boy or your slave; whatever Sarah tells you, do as she says, for it is through Isaac that offspring shall be continued for you. As for the son of the slave-woman, I will make a nation of him, too, for he is your seed.” Early next morning Abraham took some bread and a skin of water, and gave them to Hagar. He placed them over her shoulder, together with the child, and sent her away. And she wandered about in the wilderness of Beer-sheba. When the water was gone from the skin, she left the child under one of the bushes, and went and sat down at a distance, a bowshot away; for she thought, “Let me not look on as the child dies.” And sitting thus afar, she burst into tears. God heard the cry of the boy, and a messenger of God called to Hagar from heaven and said to her, “What troubles you, Hagar? Fear not, for God has heeded the cry of the boy where he is.
ויגמל. לְסוֹף כ"ד חֹדֶשׁ (גיטין ע"ה):

ויגמל AND HE WAS WEANED — at the end of twenty- four months (Gittin 75b).

Since Yitzchak was born on Pesach, the celebration of his weaning would be his second birthday, (24 months old).
משתה גדול. שֶׁהָיוּ שָׁם גְּדוֹלֵי הַדּוֹר שֵׁם וָעֵבֶר וַאֲבִימֶלֶךְ (בראשית רבה):
משתה גדול A GREAT FEAST — it is so designated because the great men of that generation were present at it (Genesis Rabbah 53:10) — Shem, Eber and Abimelech (Tanchuma Yashan, Vayishlach 23).
מצחק. לְשׁוֹן עֲ"זָ, כְּמוֹ שֶׁנֶּאֱמַר וַיָּקֻמוּ לְצַחֵק (שמות ל"ב), דָּ"אַ לְשׁוֹן גִּלּוּי עֲרָיוֹת, כְּמָה דְּתֵימָא לְצַחֶק בִּי (בראשית ל"ט), דָּ"אַ לְשׁוֹן רְצִיחָה, כְּמוֹ יָקוּמוּ נָא הַנְּעָרִים וִישַׂחֲקוּ לְפָנֵינוּ וְגוֹ' (שמואל ב ב'), שֶׁהָיָה מֵרִיב עִם יִצְחָק עַל הַיְרֻשָּׁה וְאוֹמֵר אֲנִי בְּכוֹר וְנוֹטֵל פִּי שְׁנַיִם, וְיוֹצְאִים בַּשָּׂדֶה וְנוֹטֵל קַשְׁתּוֹ וְיוֹרֶה בוֹ חִצִּים, כְּמָה דְּתֵימָא כְּמִתְלַהְלֵהַּ הַיֹּרֶה זִקִּים וְגוֹ' וְאָמַר הֲלֹא מְשַׂחֵק אָנִי (משלי כ"ו):
מצחק MAKING SPORT — This means worshipping idols, as it is said in reference of the Golden Calf, (Exodus 32:6) “And they rose up to make merry (לצחק).” Another explanation is that it refers to immoral conduct, just as you say in reference to Potiphar’s wife, (Genesis 39:17) “To mock (לצחק) at me.” Another explanation is that it refers to murder, as (2 Samuel 2:14) “Let the young men, I pray thee, arise and make sport (וישחקו) before us” (where they fought with and killed one another) From Sarah’s reply — “for the son of this bondwoman shall not be heir with my son״ — you may infer that he (Ishmael) was quarrelling with Isaac about the inheritance, saying, “I am the first-born and will, therefore, take a double portion”. They went into the field and he (Ishmael) took his bow and shot arrows at him (Isaac), just as you say (Proverbs 26:18-19) “As a madman who casteth firebrands, [arrows and death] and says: I am only מצחק mocking” (Genesis Rabbah 53:11).
עם בני עם יצחק. מִכֵּיוָן שֶׁהוּא בְנִי אֲפִלּוּ אִם אֵינוֹ הָגוּן כְּיִצְחָק, אוֹ הָגוּן כְּיִצְחָק אֲפִלּוּ אֵינוֹ בְנִי, אֵין זֶה כְדַאי לִירַשׁ עִמּוֹ, קַ"וָ עִם בְּנִי עִם יִצְחָק, שֶׁשְּׁתֵיהֶן בּוֹ (בראשית רבה):
עם בני עם יצחק WITH MY SON, WITH ISAAC —For since this is my son, even though he were not as good as Isaac really is, or if he were as good a man as Isaac really is, even though he were not my son, this one (Ishmael) is not deserving of inheriting with him: how much less is he deserving of inheriting with my son, with Isaac — with one who possesses both these qualities (of being my son and of being the good man Isaac) (Genesis Rabbah 53:11).
לחם וחמת מים. וְלֹא כֶסֶף וְזָהָב, לְפִי שֶׁהָיָה שׂוֹנְאוֹ עַל שֶׁיָּצָא לְתַרְבּוּת רָעָה:
לחם וחמת מים BREAD AND A BOTTLE OF WATER — but not silver and gold, because he hated him for taking to degenerate ways (Exodus Rabbah 1:1).
The gemartria of בְיִצְחָ֔ק is 210 (100+8+90+10+2).
At a juncture in Jewish history, the role of Yishmael is unclear despite the primary role of Yitzchak. The expulsion of Yishmael solidifies Yitzchak being the sole inheritor of the Brit Bein h'Bitarim. G-d now reinforces with Avraham that it is through Yitzchak that Avraham's legacy. The birth of Yitzchak marked the arrival of an appropriate receptacle for the legacy of Avraham. Therefore, the 400-hundred-year count starts with the Yitzchak's birth. The gematria accounted of 210 accounts for the 210 years that Avraham's descendants were enslaved in Egypt.
Yitzchak's second birthday, being weaned, represents an important inflection point in the endurance of Avraham's influence on the world. Yitzchalk's viability reaches an important milestone of sufficence. On Pesach, Avraham's guests, including Shem and Ever, celebrated the spiritual inheritor of Avraham, the first step in the development of the Jewish nation on Pesach. Without Yitzchak, Avraham's impact on civilization would be fleeting. Yishamel did not absorb Avraham's teachings, as evidenced by his play with Yitzchak, and, therefore, would not spread Avraham's teachings and influence. The impact of the Egyptian is removed from the upbringing of Yitzchak. Until Yishmael demonstrated bad character traits, Sarah did not have a problem with Yishmeal. Sarah recognizes the importance of bringing up Yitzchak without external influences. Hagar and Yishmael are sent out with bread, which would have been matzah and water. Rashi notes that the verse specifically excludes gold and silver. This early Passover served to foreshadow the events in Egypt and the development of a nation that carries on the legacy of Avraham.