Hi @vhjody,
When you set a date-triggered flow live, it will begin to queue profiles in, if they qualify to enter the flow, each day. Since your flow starts 300 days before a wedding date, turning on the flow will run a check to see if any profiles are 300 days before their wedding date. If they are, they’ll enter the flow. The same thing will happen each night - Klaviyo will check and see if any profiles reach that 300 days before mark.
Additionally, when a profile has their Wedding Date profile property set or changed, the flow will also check to see if they profile is in the flow’s timeline, and add them in, if they are.
That being said, when setting the flow live, it will not check to see if any profiles that have a date that would already be in the flow’s timeline would enter. So if a profile has a Wedding date between 1-299 days from now, they won’t enter the flow, because the flow doesn’t check to see if they would enter. Does this answer your question?