On ClassTag, you can create as many activities you’d like and add the dates for each activity. You would need to do it multiple times to specify the date of each activity. For example, if you are planning to have five parent-teacher conference for the entire school year, you need to create five parent-teacher conference and configure each one with the date and time of the conference.
NOTE: When you create an activity, parents will automatically see it on their “Activities” page but it won’t be added yet on the Weekly Summary they’ll receive until the week when the activity will happen.
Please check this video in creating an activity.