Hi, any activity that involves other cultures, race, skin colour, aspects of disability - physical and emotional such as phobias supports and promotes diversity and equality of opportunity/equal opportunity to all.
How about
wheels on the bus. It can be used to explore multicultural customers/passengers, how transport works for people with and without mobility impairement, welcoming dogs for the sight impaired, lights for hearing impairment, air suspension/ kneeling bus for wheelchair/walker/pram access.
Best wishes