Connecting calendars is not necessary. You can disconnect your calendar and invite [email protected] as an attendee to each one of your meetings (here). You can also use an immediate invite form instead. Syncing calendars removes many issues related to inviting Sembly manually, like:
inviting Sembly from an email that is not registered or aliased in Sembly and forgetting to add aliases;
the constant need to remember to add [email protected] to the meeting attendees;
the need to remember to open the Sembly webapp and insert meeting details.