Permissibility of entering a place in which alcohol is served

It is permissible to enter a place in which alcohol served, as the following hadith in Kitab Dursat ibn Abi Mansur (one of the surviving 400 usool) - as recorded in Mustadrak al-Wasa’il by al-Muhadith al-Nuri. 

A modern context would for example be entering a restaurant which serves other tables alcohol - as long as your table does not serve alcohol.

(Mustadrak al-Wasa’il, volume 17, page 74) 

“Kitab Dursat ibn Abi Mansur: narrated from Abi al-Mughara, from al-Hasan al-Nayli, from Abi Abdilah [al-Sadiq]: 

I asked him [i.e, the Imam] about people of African origin. 

I said: ‘We enter upon them while they are in their tables drinking alcohol’. 

He [the Imam] said: ‘There is no harm for you in entering upon them’

20800] 2 - كتاب درست بن أبي منصورعن أبي المغرا، عن الحسن النيلي، عن أبي عبد الله (عليه السلام)، قالسألته عن أهل السوادقلتإنا ندخل عليهم وهم على موائدهم يشربون الخمر، قال: " ليس بدخولك عليهم بأس "