Spontaneities are things that happen without planning or being made to happen.
Spontaneities are usually good because they are fun and surprising.
Examples:
The laughter and dancing were spontaneities at the party.
We enjoyed the spontaneities of our trip.
Spontaneities make life more interesting.
The spontaneities of the day made everyone smile.
The spontaneities of nature are always amazing.
The best stories come from spontaneities.