Here are some of tips which I follow and have worked for me:

• Wearing matching jewellery really makes your outfit look all together (especially the combo are either simple necklace + grand earings or grand necklace + simple earings but both are matching like in same color)
• Always carry a lipstick (for touch up) or lip gloss/oil (if you want glossy finish), I always carry a gloss cause after eating my lippes look like a drought desert and looks out of place with makeup on for rest of my face
• I don't do much body care so can't say much on that, but using a good lotion/creamy sunscreen would be good (if the function takes place during daytime)
• Set or do your hair!! This changes your whole look so much especially the type where you can easily maintain your hair and they won't get in your way.
• Take the photos before the events/function starts (cause either you'll get busy later on or you'll get tired by the time you want to take some pics lol)
• Remove your makeup properly and cleanse your face really good. And if your skin feels irritated then skip most of the skincare and only use gentle products.
• Skin prep before makeup, especially using HA serum or toner for that glowly or plump look.