% Lab dates for \VAR{paper} \VAR{period} \VAR{year}.
\newcount\lecnum
\newcount\weeknum

\newcommand{\LabDate}[1]{%
    \lecnum #1\relax%
    \advance\lecnum by -1\relax%
    \ifcase\lecnum%
\BLOCK{for lab, date in weeks.items()}
        \BLOCK{if not loop.first}\or \BLOCK{endif -}
        \VAR{date.day} \VAR{date.strftime("%B")}% lab \VAR{lab}
\BLOCK{endfor}
        \else ????%
    \fi%
}

\newcommand{\LabDateByWeek}[2]{%
    \weeknum #1\relax%
    \advance\weeknum by -1\relax%
    \multiply\weeknum by 2\relax%
    \advance\weeknum by #2\relax%
    \LabDate{\the\weeknum}%
}