Wis. Stat. § 125.70: Trade show samples.

A manufacturer, rectifier, winery, or intoxicating liquor wholesaler may furnish, free of charge, on “Class B” premises, taste samples of intoxicating liquor to any person who has attained the legal drinking age and who is attending a trade show, conference, convention, or similar business meeting, that is held on those premises, of a bona fide national or statewide trade association that derives income from membership dues of “Class B” licensees. Taste samples may not be furnished under this section at more than 2 such events of any one trade association per year. No intoxicating liquor brought on “Class B” premises under this section may remain on those premises after the close of the trade show, conference, convention, or business meeting.