In a vase, a stem of Phal should last 3-6 weeks if you trim the cut end and change water weekly.
The small tubes with rubber cap are intended for 1-3 days only.
Flowers used as decorations without being in water will look good somewhere between 6 and 48 hours, depending upon temperature and how bright the light is.
Best solution would probably be to do decorations day before, but store in cool and dark room. Bring to tables only just before the event starts.
Second best: Buy the foam blocks used by florists, and cut down to size that will fit onto candlesticks. This will provide some water for cut flowers, but will require more flowers & 'greenery' to mask the foam base.
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