Synonym for Advent is "appearance"

commencement [noun]

means "origin"
start, initiation, genesis, beginning, opening, advent

emergence [noun]

means "rise"
advent, evolution, appearance, development, visibility

genesis [noun]

means "origin"
start, initiation, commencement, beginning, opening, advent

adventitious [adjective]

means "fortuitous"
chance, unintentional, casual, accidental, random, involuntary, contingent

adventure [noun]

means "risk"
venture, chance, wager, peril, hazard, jeopardy, danger

adventurous [adjective]

means "bold"
defiant, daring, hardy, audacious, stalwart, brave, doughty

accidental [adjective]

means "fortuitous"
chance, unintentional, casual, adventitious, random, involuntary

audacious [adjective]

means "courageous"
bold, daring, adventurous, brave, dauntless, fearless

casual [adjective]

means "chance"
accidental, unplanned, spontaneous, fortuitous, adventitious, unexpected

chance [noun]

means "event"
opportunity, occasion, adventure, opening, prospect, coincidence

daring [adjective]

means "bold"
defiant, adventurous, hardy, audacious, stalwart, brave

dashing [adjective]

means "fearless"
bold, lively, brave, daring, spirited, adventurous

dauntless [adjective]

means "courageous"
bold, daring, adventurous, brave, audacious, fearless

doughty [adjective]

means "bold"
defiant, adventurous, hardy, audacious, stalwart, brave

enterprising [adjective]

means "energetic"
adventurous, bold, dashing, eager, ready, resourceful

escapade [noun]

means "reckless prank"
prank, caper, adventure, indiscretion, vagary, blunder

event [noun]

means "thing"
wonder, milestone, miracle, adventure, holiday, marvel

extraneous [adjective]

means "nonessential"
irrelevant, adventitious, incidental, immaterial, inappropriate, impertinent

fearless [adjective]

means "dashing"
bold, lively, brave, daring, spirited, adventurous

game [noun]

means "event"
strategy, adventure

- translate game

miracle [noun]

means "wonder"
milestone, event, adventure, holiday, marvel, celebration

occurrence [noun]

means "occasion"
accident, adventure, event

possible [adjective]

means "contingent"
fortuitous, adventitious, indeterminate

saga [noun]

means "tale"
story, legend, history, adventure, tradition

unforeseen [adjective]