Minn. Stat. § 365.23

After getting general authority to do something under section 365.20 , a town board must not spend money, enter into a contract, or levy a tax for that purpose without specific authority from a town meeting. The specific authority is to be given at the annual town meeting if still possible in the year the general authority is voted in. Otherwise, a special meeting to decide whether to give the town board the specific authority may be called on ten days' notice.