We hope that you can give us a fatwa on giving a gift to the one who performs the nikaah (marriage ceremony) on the day of the wedding. Is this permissible or not?

Praise be to Allaah. 

If
the one who performs the nikaah is given something from the Bayt al-maal
(treasury of the Muslim state), then it is not permissible for him to
take anything from those for whom he does the nikaah. But if he does
this voluntarily, and he is given something without asking for it, there
is nothing wrong with that. If he is given something because he asks
for it, I do not like that. Whoever wants to be independent, Allaah
will make him independent.