You certainly can do social spells with Evocation; as long as it is a maneuver, block or direct attack and you can thematically justify it with your element, it's doable. Examples include but are not limited to the following; (categorized by element)
Air
Words of Power: you adapt the tone and intensity of your words to the situation by manipulating sound waves. You can speak and be heard across a room, make your voice more alluring than normal, clear away the betraying timbre of a lie or borrow a tone of speech from a famous politician. 4-shift air maneuver to apply relevant sticky aspect to yourself.
Twisted Voice: you manipulate sound waves to distort the voice of the opposition, robbing them of credibility. An intimidating adversary may find himself with a new girlish voice, a white-court seductress now croaks like a frog or, more subtly, a witness' voice might tremble with doubt, a lawyer's voice might sound condescending to the judge and jury and so on. 6-shift air maneuver to apply relevant sticky aspect.
Silence: you may rob a target of the ability to speak to counter your words or impose silence on a room to forcibly end arguments or unwanted comments. Your targets may not like being thus silenced but barring use of their own magic or resorting to nonverbal signals, there's not much they can do. Air block vs Social actions. Strength/area depends on your power.
Unnerving Ambience: you produce ambient sounds (usually at supersonic or subsonic frequencies) that instigate fear to most mammals in the area. 6-shift air maneuver to apply sticky aspect in the area taggable/invokeable for intimidation.
Earth
Fluctuating Gravity: by manipulating gravity, you make the target's weight rapidly and constantly shift by a tiny margin, disrupting their balance and causing debilitating nausea. Being violently sick is as debilitating in a party or legal meeting as it is in combat - if not moreso - and gravity based spells are only visible to supernatural senses. Offensive Social (or physical) block, power/duration varies.
Forced Obedience: you telekinetically force the target's body to assume a simple, brief stance: forcing them to kneel, bow to you, kiss your hand or similar action that shows your superiority. In many situations this ensures your social dominance. In other situations, this might enrage your target. In some situations, this may backfire if it fails so use it wisely. Social Attack opposed by Might or Rapport, whichever is higher.
Crumble: using earth magic, you weaken a small metal, stone, wood, crystal or similar object to the point of breaking; when someone next handles it it will shatter with harmless but potentially embarassing results; a glass of wine breaking and wasting someone's clothes, a chair crumbling and depositing its occupant to the ground, a belt buckle snapping and no longer holding someone's trousers and other fun stuff to do in a party, business meeting or legal battle. 4-shift earth maneuver, applying sticky aspect to be tagged/invoked for effect.
Water
Cold Shower: you feel as if you're under a continious, really cold shower; seductive vixens, infuriating smartasses, canny smoothtongues - they all find it exceptionally hard to get the expected reaction out of you. Defensive Block vs social, power/duration varies.
Taste of Winter: you drastically lower the temperature of the gathering's formal dinner, drinks, pool or other relevant, socially-important accessory, causing the host more than a little discomfort. Alternatively, do it on a single target's accessory to disrupt their good time and social graces. 6-shift water maneuver, applying taggable aspect on object or area.
Slippery Slope: you cause someone to slip by forming a thin layer of ice in their shoes. That can be embarassing, especially at crucial moments like when giving a speech, performance or presiding over a major social event. 6-shift water maneuver, tagged/invoked for effect.
Fire
Rising Tempers: you cause the target to warm physically and emotionally by warming him up and speeding up his pulse and body - or everyone in a zone to do the same. 8-shift fire maneuver applying 2 relevant taggable (sticky) aspects on a target, 10-shift for a zone.
Searing Pain: you send a powerful shock through the target's body, similar to (but usually stronger and more refined than) a brief bout of torture via electricity. Useful for torture, intimidation, really shutting someone up, briefly disabling them or enraging them, depending on the situation and how it is used. Have fun. Block vs all actions OR intimidation attack. Power/duration varies.
Spirit
Terror: you conjure a brief but thoroughly terrifying illusion you can use to scare people. Intimidate attack. Power varies.
Strip Emotion: you deaden the target's capacity for certain emotions. The target is now much harder to seduce, infuriate or intimidate, being able to think clearly regardless of how opponents try to undermine him. Social Defensive spirit Block, power/duration varies. Using this on someone without their consent violates the 3rd Law.
Cloak of Insignificance: you impose a subtle but powerful sensory veil on the target, making everyone else ignore them, their actions and their words. The target fades into insignificance, unable to affect the social situation. Social Offensive spirit Block, power/duration varies. Using this on someone without their consent does not break any Laws as it affects the perception of others and not emotions or thoughts.
Tower of Iron Will: you butress your thoughts with magic, enforcing rigidity and resilience. You can fall back on this spell when your natural discipline is insufficient for the task. Power 8 spirit maneuver applying 2 sticky aspects taggable/invokeable for defense with Discipline or the closing-down aspect of Rapport.
You really don't want to see what non-standard elements like Death (for Kemmlerian Necromancy) or Void (for Outsider Magic) can do in social/mental combat.
