The revelation (wahy) is the communication of Allah to His prophets. In particular, the Qur'an is the unaltered word of Allah descended to His last Prophet Muhammad, peace and blessings be upon him and his family, as a reminder and a guidance for mankind. The word of Allah is very important for us because it is His message to His servants. Also, through revelation Allah gives His commands and prohibitions.

The Sunni tradition fully confirms the event of Ghadir Khumm and no Sunni scholar to my knowledge has ever entirely denied it. 

The Sunni masses, on the other hand, are largely unaware of this hugely important event. When known, it is considered one of many Prophetic merit narrations in favour of 'Ali and the other Companions and not anything specific to succession of 'Ali after the Prophet (a).

The differences come down to the details of what happened in that event and its context and, therefore, implication for the succession to the Prophet Muhammad (s).

Salaamun Alaykum neither are technically haram  but both lead to haram things or bad situations. What is haram is to engage in any interaction that is lustful leading to something indecent. It is for this reason that Islam has very clear guidelines when it comes to interaction between opposite genders (who are not mahram) and that is it should be formal and not be lustful in anyway nor leading to that situation.  This may even include listening to her voice if that becomes something that contributes to lustful feelings and certain imaginations.