Is there no Constitutional requirement that the business of the state must be done within the borders of the state?
The WI Constitution says assembly at the seat of government. But that still begs the question of what parliamentarian rules they abide by.
I did find this little tidbit.
Each house shall be the judge of the elections, returns and qualifications of its own members; and a majority of each shall constitute a quorum to do business, but a smaller number may adjourn from day to day, and may compel the attendance of absent members in such manner and under such penalties as each house may provide.