In a condo assoc., is the budget need to be vote by all owners during the annual meeting??

About 2 years ago, some owners were complienting about the self managed board. We got the current managemnt company, however, lots of things are done under the table - budget, and voting. There is only one board meeting in 14 months. Is it valid under the IL law? Is the budget needed to be voted on since that is impacting all the owners in the buiding? One of the current project had an estimation was extramely hight. Once getting another estimation from other owners, the same company lower the bid by more than 50%. Personally, I tend to think there is kick back to the management company. Can you give me some infomation to read on??