That he heard the Prophet saying, "It is not permissible for a man to be alone with a woman, and no lady should travel except with a Muhram (i.e. her husband or a person whom she cannot marry in any case for ever; e.g. her father, brother, etc.)." Then a man got up and said, "O Allah's Apostle! I have enlisted in the army for such-and-such Ghazwa and my wife is proceeding for Hajj." Allah's Apostle said, "Go, and perform the Hajj with your wife."
Allah set Hajj for the consolidation and reinforcement of the religion.fatimah
Walimah is only in five occasions: in the ‘Urs, Khurs, ‘Idhar, Wikar and the Rikaz – ‘Urs is when a person gets married; and Khurs is when a child is born; and ‘Idhar is on the circumcision of a baby boy; and Wikar is when a person purchases a house; and Rikaz is when a person returns from Hajj.
Allah set Hajj for the consolidation and reinforcement of the religion.