The business that the township board performs pursuant to section 20b to 20k shall be conducted at a public meeting held in compliance with the open meetings act, Act No. 267 of the Public Acts of 1976, being section 15.261 to 15.275 of the Michigan Compiled Laws. The township board shall give public notice of a meeting and the time, date, place, and purpose of the meeting in the manner required by Act No. 267 of the Public Acts of 1976 and by publishing a notice in a newspaper of general circulation in the district proposed to be assessed. If a newspaper is not circulated in the district, then notice shall be posted in at least 3 of the most public and conspicuous places in the district.