Possible Clues:

• Two-person exchange
• Confidential talk
• ... and, talking of other countries, New Year to absorb summer
• One-on-one conversation
• Three notes about drink requiring private exchange?
• Between New Year in one country and summer in another, have food and a private meeting
• Private conversation between two French people
• Heart-to-heart talk
• Nice heads keeping adult in conversation
• Four identical notes about a get-together