@Harish Selladurai Welcome to the Atlassian Community.
Team Calendars are only available in Confluence Premium and Enterprise, not Free or Standard editions. You indicate that your instance is Standard, so you will not have access to them.
If you cannot upgrade to Premium, but need calendar functionality, there are many options available in the Atlassian Marketplace that you can demo and install.
Good luck!
@Harish Selladurai was my answer able to help you? If so, please mark it as answered so others looking for similar content can find it.
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