
1) Free musical event 2) Impromptu concert 3) Impromptu jazz exhibition 4) Impromptu jazz performance 5) Impromptu musical performance 6) Impromptu playing 7) Jazz club get-together 8) Jazz get-together 9) Musical get-together 10) There are no plans for this
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https://www.crosswordclues.com/clue/jam-session
[software] Studio Session is a 1986 software program for Macintosh computers, for music creation and playback. It was created by Macintosh and Newton pioneer Steve Capps and musician Ed Bogas. The program was published by Impulse, Inc.. The software differed from other audio creation packages as it used 8-bit audio samples of real instrumen...
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http://en.wikipedia.org/wiki/Jam_Session_(software)

A jam session is a musical event, process, or activity where musicians play (i.e. `jam`) by improvising without extensive preparation or predefined arrangements. Jam sessions are often used by musicians to develop new material (music), find suitable arrangements, or simply as a social gathering and communal practice session. Jam sessions may be .....
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http://en.wikipedia.org/wiki/Jam_session
[Software] Taken in Kyoto. Can you tell by the filename that the cultural significance is lost on me? ...
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http://en.wikipedia.org/wiki/Jam_session_(Software)

Jam sessions occur when any group of musicians spontaneously gather to informally play or sing together. Members of different ensembles who do not normally play with each other, can play together just for the sake of `making music'. Spontaneous improvisation is one of the key factors of a jam session and can often be used as part of a song-writing ...
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http://www.bbc.co.uk/radio2/soldonsong/glossary/j.shtml

[
n] - an impromptu jazz concert
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http://www.webdictionary.co.uk/definition.php?query=jam%20session
noun an impromptu jazz concert
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https://www.encyclo.co.uk/local/20974

A competition in which all riders perform in the half pipe or park at the same time. One rider drops in after the next in no particular order.
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https://www.the-house.com/portal/snowboarding-terms/
No exact match found.