Wires_Guy_wires
Imperial Masterpiece
Or sit them in a bowl or soup plate of water. For 24 hours, that's usually not a problem.Not sure this is true, terracotta holds moisture longer than regular bonsai pots or plastic containers.
For longer periods of time between watering change the position of your plants to avoid direct sun or wind exposure for the weekend.
Another suggestion would be to add some shredded sphagnum moss to the surface for a few days or so to extend the watering times.
@Ply I would use about 5-10% bark flakes. But bonsai pots dry way faster in the summer, so getting away with skipping watering is taking plant death risks. A bigger pot however, holds water for longer. My minimum diameter is 12cm, internal height 3cm. Everything smaller than that, turned out to be a tree killer.