Having done EICRs for many Village Halls, Church Hals and similar to enable them to meet requirements of Electrical Safety at work regulations , insurance and local premises licence requirements, I am very surprised that EICRs have not been done for the premises you are looking at. For one Local Authority, as I was not a member of NICEIC or ECA , I had to supply copies of my qualifications before they would agree to accept my PIR (old version of EICR) on a Village Hall.

I did the remedial work on a Church that was closed for months due to a unsatisfactory PIR, the insurance company would not accept the risk until the work was done and the power had to be turned off. . 

I have just had a fire safety inspection done on a small Village Hall (Licensed for 80 people) I am associated with and the inspector wanted to check that all the electrical certificates and PAT  results were available as well as checking emergency lighting design, certificates and maintenance records. The inspector said that if something goes wrong it will be the trustees of the hall in the dock if they cannot prove they have ensured the building is safe.

As other have said there may not be a risk, but if an accident does happen blame may well be distributed widely if adequate proof of safety is not available.

A generator is sounding like a good option.

Having done EICRs for many Village Halls, Church Hals and similar to enable them to meet requirements of Electrical Safety at work regulations , insurance and local premises licence requirements, I am very surprised that EICRs have not been done for the premises you are looking at. For one Local Authority, as I was not a member of NICEIC or ECA , I had to supply copies of my qualifications before they would agree to accept my PIR (old version of EICR) on a Village Hall.

I did the remedial work on a Church that was closed for months due to a unsatisfactory PIR, the insurance company would not accept the risk until the work was done and the power had to be turned off. . 

I have just had a fire safety inspection done on a small Village Hall (Licensed for 80 people) I am associated with and the inspector wanted to check that all the electrical certificates and PAT  results were available as well as checking emergency lighting design, certificates and maintenance records. The inspector said that if something goes wrong it will be the trustees of the hall in the dock if they cannot prove they have ensured the building is safe.

As other have said there may not be a risk, but if an accident does happen blame may well be distributed widely if adequate proof of safety is not available.

A generator is sounding like a good option.