Can I close song requests before the party?
Yes. Edit the page and publish, and the section goes when you want it to. Requests already sent stay with their replies, so the deadline is about fresh submissions rather than lost ones. A week out is a comfortable point to start building the list.
Do guests see one another's requests?
Requests come to you with the reply, not to a public board. You see who asked for what and choose what gets played, which keeps the list honest and spares everyone a debate about the saxophone.
Can a guest request more than one song?
As many as your wording allows; the field sits beside the reply and takes what they type. If you want one per guest, say so plainly, because guests follow an explicit request far more readily than an implied one.
Does this work for weddings as well as parties?
It is the same machinery, and weddings use it well, from the first dance down to the songs only your own families know. Dedicated wedding pages carry the section inside the full guest site; other occasions get it on whichever page you build.
What if nobody requests anything?
It usually means the section went unnoticed, so a line in the WhatsApp message pointing at it fixes most of that. If requests still stay quiet, you own the music regardless: few parties were saved by a full request list, and many were saved by a host who knew the room.