Multicolumn is only using the width of the first column

Question

I am using the multicolumn command to cover four columns in my table, but for some reason the text within the column is wrapping within a single column width leaving the remainder of the column empty. I can see that the column is still the width I'd like, since the right strut of the cell is where it is supposed to be. I think it may be related to my use of the tabularx environment, but I need it to allow the table to shift to fit the different possible cell values.

\documentclass{article}
\usepackage{fullpage}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{helvet}
\renewcommand{\familydefault}{\sfdefault}
\usepackage[none]{hyphenat}
\usepackage{array}
\usepackage{bigstrut}
\begin{document}
\begin{center}
\begin{tabularx}{\textwidth}{|l|X|X|X|X|X|}
\hline
\textbf{Meeting Date:} & 2009/08/01 & \textbf{Type:} & Party & \textbf{Today's date:} & 2014/01/14 \bigstrut \tabularnewline 
\hline
\textbf{Meeting Location:} & \multicolumn{4}{X|}{This is the long string of text that I would like to break but when it has filled four columns rather than one.} & \bigstrut \tabularnewline
\hline 
\textbf{Current Weather:} & \multicolumn{5}{l|}{Cloudy and sunny} \bigstrut \tabularnewline
\hline 
\textbf{Sector:} & \multicolumn{5}{l|}{Food and Produce} \bigstrut \tabularnewline
\hline 
\end{tabularx}
\end{center}
\end{document}

Answer 1

The tabularx documentation clearly states:

Do not use \multicolumn entries which cross any X column.

You can substitute your

\multicolumn{4}{X|}{This is the long string...}

with

\multicolumn{4}{p{4in}|}{This is the long string...}

Complete code:

\documentclass{article}
\usepackage{fullpage}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{helvet}
\renewcommand{\familydefault}{\sfdefault}
\usepackage[none]{hyphenat}
\usepackage{array}
\usepackage{bigstrut}
\begin{document}
\begin{center}
\begin{tabularx}{\textwidth}{|l|X|X|X|X|X|}
\hline
\textbf{Meeting Date:} & 2009/08/01 & \textbf{Type:} & Party & \textbf{Today's date:} & 2014/01/14 \bigstrut \tabularnewline
\hline
\textbf{Meeting Location:} & \multicolumn{4}{p{4in}|}{This is the long string of text that I would like to break but when it has filled four columns rather than one.} & \bigstrut \tabularnewline
\hline
\textbf{Current Weather:} & \multicolumn{5}{l|}{Cloudy and sunny} \bigstrut \tabularnewline
\hline
\textbf{Sector:} & \multicolumn{5}{l|}{Food and Produce} \bigstrut \tabularnewline
\hline
\end{tabularx}
\end{center}
\end{document} 

Output: