Answer:
- at the time of nikah
- after the nikah
- when the bride and bridegroom meet in privacy
- after the couple have met in privacy
- from the time of nikah till after the couple have met in privacy
The preferred view is that the walimah should take place after the bride and bridegroom have met in privacy (i.e. up to two days after the couple have met in privacy. After that, it will be an ordinary feast, not walimah).
Hence, if there is a feast at the time of nikah, it will be regarded as walimah according to the view of some scholars, although according to the preferred view, it will not be regarded as walimah (instead it will be regarded as an ordinary feast).
In any case, a feast at the time of nikah will be permissible, provided that the gathering is free from haram and sinful elements. [1]
And Allah knows best.
Mufti Faizal Riza |