\[
\begin{array}{|c|}
\hline
\begin{array}{c}
\textbf{Date:} \text{(Insert Date)} \\[0.4cm]
\textbf{Subject:} \text{Invitation: Workshop on Drug-Free Pain Management and Reversal} \\[0.4cm]
\text{Dear Members,} \\[0.2cm]
\text{To commemorate World Health Day, we cordially invite you} \\
\text{to a workshop focused on \textbf{Drug-Free Pain Management and Reversal}.} \\[0.2cm]
\hline
\textbf{Workshop Details:} \\
\textbf{Date:} \text{(Insert Date)} \\
\textbf{Time:} \text{(Insert Time)} \\
\textbf{Venue:} \text{Civil Medical Hall, Sheesh Nagar} \\[0.4cm]
\text{We urge all members to attend promptly and engage actively} \\
\text{in this crucial session. Your participation will significantly enhance the discourse.} \\[0.4cm]
\textbf{Sincerely,} \\[0.2cm]
\textbf{Secretary} \\
\text{Civil Medical Doctors Association} \\
\end{array} \\
\hline
\end{array}
\]