GHL: Calendar set-up

Last updated: January 5, 2026

There are different types of calendars in GHL, that can be integrated with Charlie to enable seamless appointment booking during conversations. While integration is straightforward, certain calendar types require specific configurations to prevent double bookings and ensure smooth operation. This guide covers a quick description of available calendar types, specific considerations, troubleshooting section and key insights for successful setup.

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Calendars

  • Service calendars: tailored to simplify the scheduling process of service-based businesses. Users can create different services they offer, group them together by categories, and display all of them in one single scheduling link.

  • Round robin: allow businesses to distribute appointments evenly among multiple team members. This feature ensures that scheduling is efficient, fair, and optimized based on availability or workload balance. 

  • Class booking: designed to manage one-to-many events where multiple invitees can attend a single booking. These calendars are ideal for webinars, workshops, or training sessions.

  • Collective booking: enables scheduling meetings involving multiple team members simultaneously. It integrates individual team members' availability into a shared calendar, allowing for unified scheduling

Most used calendar for our integration is Round Robin type.

Specific considerations

Service calendars

  • Define clear service descriptions so Charlie can guide leads to appropriate options

  • Configure appropriate booking windows (how far in advance booking is allowed)

  • Establish minimum notice periods to prevent last-minute bookings

Round robin

  • Ensure all team members' calendars are properly connected

  • Set individual availability preferences for each team member

  • Configure distribution logic (truly even, priority-based, or skill-based)

  • Establish backup protocols if all team members are unavailable

  • Define what constitutes "availability" (only specific calendar blocks, or any non-busy time)

Must have clear availability logic so Charlie can accurately communicate available time slots without promising times that won't be honored.

Class booking

  • Set appropriate capacity limits

  • Define minimum attendee requirements (if applicable)

  • Decide on confirmation requirements (automatic vs. manual approval)

Collective booking

  • Clearly define which team members must attend

  • Set appropriate meeting duration accounting for multiple participants

  • Establish protocols for last-minute cancellations by team members

  • Define backup team members if primary members become unavailable

Collective calendars have the highest complexity for availability because they require consensus across multiple schedules. More calendars mean fewer available slots.

Configurations:

Double booking: to prevent one of the most critical issues in calendar integrations, you can follow these steps to reduce the risk of this problem across all calendar types.

In GoHighLevel:

  1. Navigate to Settings → Calendars

  2. Select the calendar integrated with Charlie

  3. Open Advanced Settings or Availability Settings

  4. Locate "Check for conflicts" or "Conflict detection" settings

  5. Enable conflict checking for:

    • The primary calendar

    • All connected team member calendars (for round robin/collective)

    • Any external calendars (Google, Outlook, etc.)

Verify These Settings:

  • "Check for conflicts with other GHL calendars, connected Google Calendar or connected Outlook Calendar"

  • Block time when marked as busy in external calendars

External Calendar Sync: If your team uses Google Calendar, Outlook, or other external calendars for non-GHL appointments, GHL must check these calendars to avoid double bookings.

For Google calendar

In GHL, go to Settings → Integrations → Google Calendar

  1. Connect your Google account

  2. Select which Google calendars to monitor for conflicts

  3. Enable "Mark as busy" for events in Google Calendar

  4. Set sync frequency (recommend: every 5-10 minutes)

  5. Test by creating an event in Google Calendar and verifying it blocks GHL availability

For Outlook/ Office 365

In GHL, go to Settings → Integrations → Outlook

  1. Connect your Microsoft account

  2. Select which Outlook calendars to monitor

  3. Enable conflict detection with Outlook events

  4. Configure sync frequency

  5. Test integration with a sample Outlook event

Ensure the sync is bidirectional:

  • GHL bookings appear in external calendar (prevents manual double-booking)

  • External calendar events block GHL availability (prevents automatic double-booking)

Round Robin Specific Settings For round robin calendars, there are some additional configurations that prevents conflicts:

Priority and Distribution Logic:

  1. Navigate to your Round Robin calendar settings

  2. Configure distribution method:

    • Even distribution: Rotates strictly through team members

    • Availability-based: Prioritizes whoever is most available

    • Least busy: Routes to person with fewest upcoming appointments

  3. Set "Skip if unavailable" to automatically exclude busy team members

  4. Configure "Max appointments per day/week" per team member (prevents overloading)

Individual Availability:

  1. Ensure each team member has connected their personal calendar

  2. Verify individual availability schedules are configured

  3. Test that individual conflicts properly prevent their slot allocation

  4. Establish backup protocols if all team members are simultaneously unavailable

Visual guidance

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Troubleshooting

Despite proper configuration, double bookings can occasionally occur. Here's how to diagnose and/or solve them.

  • Go to Calendar, select Calendars and look for the bookings that has double booking issues. Click it to view details. Go to right side panel and click Activity Log. Activity log will help you troubleshoot the issue. You can also view JSON payload to know more about the backend.

  • If there are more than 1 booking for 1 host per time slot. Go to Calendar → Calendar Settings → Find the calendar you wanna check → Edit Calendar → Availability. Ensure that the Maximum bookings per slot per user is set to 1

  • Review GHL Logs: In GoHighLevel, navigate to "Settings" → "Calendars" → Select the affected calendar → Open "Logs" or "Activity" tab → Filter for the date/time of the double booking.

    • Look for: Timestamp, which system created each booking, any error messages or warnings

  • Verify Third-Party Integration: The most common cause of double bookings is external calendar events not properly blocking GHL availability.

    • Solution: Open Third-party Calendar → Locate the conflicting time slot → Check if an event exists there → Verify the event is marked as "Busy" not "Free" (Must be "Busy" for GHL to recognize it) → Confirm the calendar is connected to GHL → Check last sync time

  • Fix Third-Party Issues: If external events show as "Free":

    • Change all relevant events to "Busy"

    • Establish a policy that all calendar events must be marked "Busy"

    • Train team members on proper calendar marking

  • Common Round Robin Issues:

    • Team member's external calendar not properly synced

    • Individual availability overridden by calendar-wide settings

    • Distribution logic not accounting for partial availability

    • Multiple team members marked unavailable simultaneously (defaulting to showing slots anyway)

Key Insights

  • The majority of double bookings occur because external calendars (Google, Outlook) aren't properly connected or aren't marking events as "Busy." This is your #1 priority in configuration.

  • When double bookings occur, GHL logs reveal exactly what went wrong. Don't guess, always check logs to identify the root cause and prevent recurrence.

  • The simplest calendar setup that meets your needs is usually the most reliable. Avoid unnecessary complexity in calendar configurations.