We have an event calendar! This means that if you and some friends are going to play some BR tomorrow at noon, and want more players to join, you just post a new topic, and set the calendar event settings. Then everyone visiting the forum will see it.
The topic subject will be the text shown in the calendar, so use a short, descriptive subject, like 'Bank robbery' or 'BR/Duel' And put details like server name/address/player limit in the post body. Then people can just click on the entry in the calendar, and they will be taken to the post. How great is that?
Just make sure that the timezone on the bottom of the page ('All times are GMT + ?) is correct for your location before you enter the time for the event. I think you just enter your local time, and then it will be calculated correctly for everyone else.
It seems the developers have mixed the 12h/24h systems a little, (probably americans, then ), because there is no way to specify midnight. You can't set hour to 0, so you have to use 23.59 instead. This could also mean that if you set the time to 23:00, someone in a timezone one hour ahead will only see the date, not the time, which should have displayed as 0:00. Maybe specify time in gmt in the post body to be safe.