Adoption of audited balance sheet in case of listed co

hello friends by profession i am CA & CS , Right now At a Post of company secretary in listing company, but i have no membership no of cs as some training is remaining , so my question are 
1. can CS post in listing co vacant for some time ? any penalty 
2. How The Audited Balance sheet is to be adopted i.e before 30 may you have to adopt the Audited balance sheet in Board meeting ,
one of my friend told me that 2 director and CA signature are sufficient for Adoption of BS before 30 may