View source for GullSO Invitational

{{Infobox invitational tournament
|state=California
|lat=37.703672
|long=-122.078275
|Location=19400 Santa Maria Avenue {{break}} Castro Valley, California 94546
|Year started=
|teams_b=
|teams_c=
|Division=C
|ChampionB=
|ChampionC=
|Date=December 13th, 2025
|1stBName=
|1stBPoints=
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|2ndBPoints=
|3rdBName=
|3rdBPoints=
|1stCName=
|1stCPoints=
|2ndCName=
|2ndCPoints=
|3rdCName=
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|scilympiad={{Scilympiad|cvhs}}}}

Named for the winged monsters that terrorize unsuspecting students at Castro Valley High School, GullSO has been terrorizing unsuspecting SciOly students since 2023, when Castro Valley decided to create this monster.  GullSO takes place in mid-December and is run by Castro Valley Science, a 501(c)3 that organizes the Science Olympiad teams in Castro Valley.  It is currently only aimed at Division C and typically accepts around 35-40 teams each year.

The test writers are typically college alumni from schools across the nation. The CVHS varsity team and an army of parent volunteers become Event Supervisors for this tournament.
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== Results ==
{{Invitational results box
|div=C
|2026={{Irb row
|first_name=
|first_points=
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|second_points=
|third_name=
|third_points=
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|fourth_points=
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|fifth_points=
|teams=
|date=
}}
}}

=== Scoresheets ===

:2026