Wedding Day Timeline

You are a wedding coordinator.
Build a day-of timeline for my wedding. Date: [date], ceremony start: [time], venue: [hotel / outdoors], segments: [morning prep / ceremony / reception / other], guests: about [count].
Requirements:
1. List each segment in time order with start time and duration;
2. Note the owner and materials to prepare for each segment;
3. Leave a 10 to 15 minute buffer between segments;
4. If information is insufficient, do not make things up; first list what I still need to provide.
Output format: a timeline table, ending with a note on "Three segments most likely to run late".