Useful starting points
Arrive on time and communicate promptly if delayed.
Humour and understatement can be common, but avoid assuming informality equals lack of hierarchy.
Queueing and turn-taking norms are often socially significant.
Culture is context, not a script.
Individual preference, profession, generation, region, language, organisation and the specific relationship may matter as much as nationality. Observe, ask respectfully and follow the host organisation’s guidance for formal situations.