Settings - LMM Meeting - tab 'Schedule'
Find the week in the top box and select.
Then in the bottom box find the LN part, and change 'theme' /'source'/'timing' (doubleclick in the respective cells and modify).
This can allways be used to enter the local needs theme, or when the local needs are changed like e.g. by a letter. Sometimes a new subject replaces two scheduled ones. In that case modify the first, then to remove the second highlight that second one and click the minus sign next to the bottom box (not the minus sign next to the top box, as this will erase the entire meeting!)