Форум поддержки Thunderbird

My work schedule revolves around the first Thursday of the month. Creating events recurring on the first Thursday or Friday is not a problem of course.

However, I am trying to set up recurring events /relative/ to the first Thursday, e.g. for the Monday of that week.

Can this be done in Thunderbird Calendar? Happy to do some manual editing of calendar files if that would help.

Thank you!

How can I get back to being able to search for an old calendar event of up to 2 years ago, now that a recent Thunderbird update removed that ability and replaced it with the 7 search periods option box to the left of the 'contain' search window?