ProcessMaker Team is planning to add new calendars inside ProcessMaker interface for the Community Edition, that's why we are looking for someone who has experience, knowledge or maybe someone who has developed this type or calendar. Any contributions will be really appreciated and of course mentioned on our wiki and release notes.
You can post your contributions on this post, or sending it by email to lilianaATcolosaDOTcom
Thank you very much for being involved with ProcessMaker!!