Waheguru Ji Ka Khalsa Waheguru Ji Ki Fateh The standard practice at every gurudwara sahib is when congregation is happening only one thing is supposed to be done at one time. Either reciting bani from guru granth sahib or kirtan or ardaas at a time. Usually guru granth sahib ji is covered with rumala sahib during ardaas or while the kirtan is going on. Guru granth sahib ji is only uncovered for reading hukumnama or for doing sahej path or doing akahand path. This is what my basic understandi