Hello,
First, please post on the good forum for iCagenda
Secondly, you are making a confusion between component (pages - main content) and modules (using position).
By a search on this forum, you will find some tips to try to integrate a component inside an html content (so could be a module HTML) but depending of the other extension you will use to do that, and often depending of the coding of your site template, you can maybe manage this.
In all cases, what you have to search for (here or on other joomla websites/forums) is how to included a component in a module position/article content
Good luck!
Best Regards,
Cyril