There's this reality TV show where strangers meet at the altar for the first time and get married on the spot. Like a really intense arranged marriage. Would this sort of thing be permissible in Halacha? Could a couple meet for the first time at kabbalas panim for example?
It might theoretically and halachicly be possible to set it up if you had two kosher witnesses. But since this marriage would be real, i.e., require a get (divorce) to undo it, it would be highly unwise.
For practical reasons a real-time wedding is not possible as there is a due process that needs to take place ahead, e.g., in Israel you need to register, prove Jewishness, take kallah classes.
In the Israeli version of the show, participants do not get married halachicly. The Jerusalem Post writes
The Chief Rabbinate sees the transformation of the institution of marriage into a television program as a desecration of the sanctity of the supreme value of family life and marriage. Participants in this program could find themselves in complex halachic situations that could place them and their future descendants in a halachicly questionable status.
As to whether such an idea even works, the article continues
Of the 12 couples who wed in the first four seasons of the show, just two remain married today. In the UK, all seven couples who have participated are now divorced.