I would like to see a feature where we could rent nightclubs and other places for events.

It should be quite simple. Make some static "dungeons" that look like nightclubs, shops or whatever. Instead of the regular door put in the type that is in mission areas where you need a key to get in.

Put up a shop terminal besides there door where you can buy a key for 100.000 - 1.000.000 creds. The key lasts for [x] hours and during that time it cannot be bought in the shopping terminal.

You can then make copies from a mission key duplicator and give out/sell to the people who are attending you event.

-Neph