How to link invoices/opportunities/events to calendar


I am setting up suiteCRM to be the management system used for a music agency and we need our projects to show up on the calendar so that we can physically when our events are, but the calendar only seems to be for meetings etc.
Is there any way of getting the calendar to include the dates of the leads/opportunities or even events?

Thanks in advance.

Projects and tasks will show in Sugar/ Suite Calender.

I know they don’t show in Outlook, because it has really bad iCal integration. There are other Email / Calender clients that will work with tasks such as Mozilla Thunderbird.