What is the proper Islamic way to conduct the function of marriage (e.g. Nikkah, and Walima)?

I lived in Pakistan, there the people do different functions for the celebrations of marriage (e.g. Hina Rasam, Barat, and Walima). In my knowledge, only Walima is acceptable in Islam (I've read some hadiths). So, my question is Is it right to exhibit the bride and groom in the event of Walima, where people taking pictures and giving them greetings? Or isn't it enough that we should only give them food (food of Walima) and meet with them (celebrate) and say goodbye to the guests?