The guests and the host organization took a commemorative group photo.
Tips
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Highly formal, almost exclusively in titles of official events, ceremonies, and documents. Equivalent to 和 or 以及 in everyday speech, but conveys more gravitas.
Bottom 旦 - sun (日) above the horizon (一), depicting dawn. Contains the indexing radical 日 inside. The original meaning of 暨 was 'the sun barely showing,' so the dawn picture is etymologically core: a partial sunrise, only the top edge visible.
Top 既 supplies the sound jì with no shift - a clean phonetic. 既 originally pictured a person turning from a food-vessel having finished eating, hence 'already done.' That completion nuance bleeds into 暨: the literary 'and, up to' marks a reach completed.
