Hi Luis
Thanks for the interest in our plugins!
I believe our plugins will work for you. It sounds like you may just need our free “The Events Calendar” (here’s a link to our Events Calendar Pro in case you need additional features) and then purchase a single site license of our iCal Importer (if you are only going to have it on one site – multisite if you’ll be activating on multiple sites).
Our iCal Importer can “fetch” – whatever you publish in Google Calendar. You can can even create an automated “fetch” rule to pull your new Google Calendar events that you enter in the future.
You can then use the iCal Importer to fetch events from your subdomains (for your main home page calendar) and create scheduled imports from your other calendars. From there, you can embed a calendar widget on your home page to show all these events.
*Please note that there is an iCal URL within The Events Calendar that Google Calendar can use to import events as well (e.g. http://yoursite.com/events/ical), but it’s up to Google Calendar when it pulls those events or you can export this file and import it into your Google Calendar manually, our plugins do not outwardly send out the event information to a service such as Google Calendar.
Thanks again for your interest. Let me know if there’s any other questions I can answer for you!
Cheers!
Jeff