Is there a legitimate Shariah basis for a husband's objection to his wife attending a women's recreational event—held in a hotel ballroom without cameras or musical instruments, and involving wearing luxurious clothes—especially given that regular women's gatherings are available?

If women's gatherings are regular, based on permissible entertainment, and do not include forbidden singing, backbiting, or gossip, and women attend them dressed modestly and wearing hijab, then this is a good matter. It is a sign of a man's noble character to allow his wife to attend them, and the wife should thank him for that. The same applies to a gathering in a public hall if it is free from disobedience and violation of Islamic law; it is a good matter and not considered a waste of time as long as it occurs at spaced intervals and does not require a specific occasion. There is no objection to women wearing their luxurious clothes, free from extravagance, in front of each other, provided they cover their awrah. There is no harm in trying to persuade the husband to allow attendance, and if he permits it, that is good; if he refuses, then obedience to him is obligatory. However, one must be careful that the purpose of these parties is not merely to boast about luxurious clothes, for that involves self-admiration and arrogance, which are forbidden by Islamic law. On the authority of Abu Hurayrah, may Allah be pleased with him, he said: The Prophet, may Allah's peace and blessings be upon him, said: "While a man was walking, admiring himself in a garment, with his hair combed, Allah caused the earth to swallow him up, and he will continue to sink into it until the Day of Resurrection." And on the authority of Iyad bin Himar, the Prophet, may Allah's peace and blessings be upon him, said: "Indeed, Allah has revealed to me that you should be humble, so that no one boasts over another."