appearance - the event of coming into sight

Parousia, Second Advent, Second Coming, Second Coming of Christ, Advent - (Christian theology) the reappearance of Jesus as judge for the Last Judgment

epiphany - a divine manifestation

theophany - a visible (but not necessarily material) manifestation of a deity to a human person

Word of God - a manifestation of the mind and will of God

indicant, indication - something that serves to indicate or suggest; "an indication of foul play"; "indications of strain"; "symptoms are the prime indicants of disease"

appearance - the event of coming into sight

lamentation, mourning - the passionate and demonstrative activity of expressing grief

laughter - the activity of laughing; the manifestation of joy or mirth of scorn; "he enjoyed the laughter of the crowd"

demo, demonstration - a visual presentation showing how something works; "the lecture was accompanied by dramatic demonstrations"; "the lecturer shot off a pistol as a demonstration of the startle response"

act - a manifestation of insincerity; "he put on quite an act for her benefit"

ebullition, effusion, outburst, blowup, gush - an unrestrained expression of emotion

protest, dissent, objection - the act of protesting; a public (often organized) manifestation of dissent

Boston Tea Party - demonstration (1773) by citizens of Boston who (disguised as Indians) raided three British ships in Boston harbor and dumped hundreds of chests of tea into the harbor; organized as a protest against taxes on tea

work-in - occasion when workers continue to work as a protest against e.g. proposed dismissal or closure of the factory

protest march - occasion when you can express opposition by marching (usually on some government institution) without a license

political science, politics, government - the study of government of states and other political units