Is it permissible to eat food offered by actors and riba-based banks?

In some countries it is very common for food to be offered in
Ramadan; this is done by some charitable organisations and people who are
known for their religious commitment and righteousness, or by some business
people who we think are good people. In these cases, there is nothing wrong
with the Muslim eating from that food, and we ask Allah to decree a great
reward for those who do that. 

It is also very common for some actors, dancers and others
whose work and earnings are haraam, and some riba-based organizations such
as banks, to offer food in this manner. 

This kind of food should be shunned and one should not eat
from it. This is the least that the Muslim can do to denounce the evil
actions of those people and to rebuke them for their haraam and
reprehensible actions. 

It is not befitting for the fasting Muslim to be the guest of
a female dancer or actress, or a thief who is well known for stealing and
embezzling the public wealth, and to eat iftaar at their tables. 

It is also inappropriate to be the guest of those against
whom Allah, may He be exalted, has declared war, namely the riba-based banks
which openly commit that which is even more haraam than dancing and acting. 

It is no secret that these people are trying to draw close to
ordinary people by means of these actions and to become more famous.
Otherwise, if they really wanted to do good, they would give up the evil
actions and haraam deeds that they are doing. That is the best thing that
they could do for themselves. And Allah is Good and does not accept anything
but that which is good (or halaal). 

This food that is offered by the riba-based banks should not
be partaken of for another reason, which is that offering this food is
nothing more than an advertisement for this riba-based bank, so it is not
permissible for the Muslim to partake of it. 

The scholars have forbidden advertisements for riba-based
banks that are more low-key than this. 

The scholars of the Standing Committee for Issuing Fatwas
were asked: 

Is it permissible to put up Ramadan timetables produced by
some banks in the mosques, or not? 

They replied: 

It is not permissible to put up Ramadan timetables produced
by some banks or other businesses in the mosques, because that is something
concerning which there are shar‘i reservations, like advertising haraam
transactions, making the houses of Allah places to promote and advertise
commercial products, and other things that are contrary to the sanctity of
the mosques… End quote. 

Shaykh ‘Abd al-‘Azeez ibn Baaz, Shaykh ‘Abd al-‘Azeez al
al-Shaykh, Shaykh ‘Abd-Allah ibn Ghadyaan, Shaykh Saalih al-Fawzaan, Shaykh
Bakr Abu Zayd 

Fataawa al-Lajnah al-Daa’imah,
vol. 2, 5/239-240 

And Allah knows best.