Café Del Mar Phuket questions

Hi, I plan on going to CDM tomorrow night (Friday) for the event. But I have some questions :

1. What do guys/girls normally wear for the DJ events? Also For footwear just sliders or sandals will do?

2. It says free entry but I can’t reserve a table without committing to a minimum spend, do I just show up, and whats a good time to get there?

3. If I don’t reserve a table will I literally not have anywhere to sit down at all?

Many thanks

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