Looking for interesting volunteer work?

How about cleaning at a city hall. People of the city hall needs your help. You can be very useful there!

Where: Washington City Hall
When: every Friday
Tel 011-123-4567

(Are the poster for volunteers grammatical? Would you like to take a look at that?)

People . . . need

The poster for volunteers at the Washington City Hall contains some minor grammatical errors. Here is a corrected version:

"Looking for interesting volunteer work? How about cleaning at City Hall? The people of City Hall need your help, and you can be very helpful there!

Where: Washington City Hall
When: Every Friday
Tel: 011-123-4567"

This version of the poster is more concise and grammatically correct. It provides all the necessary information in a clear and organized manner.