With regard to theHolyCow's reply and the problems we had with outside interference for the fight club trailer, I decided to look for other possible locations to host the event. I took a brief tour across Los Santos in a helicopter and found two such places. Although they remain open areas, they are well away from other players in LVP.
Location 1:
I think this is also a motel similar to the one pointed out in my original post. It's not quite as closed off or isolated as the one in LV, but still offers a nice arena space and even better spectator support on the upper levels. When I say "better" it's because there is more room here for the spectators (the balcony in the LV motel is rather narrow and cramped). The entrance to the motel courtyard could possibly be blocked with a few vehicles to ensure that fights remain in a controlled space.
Location 2:
Hmm..another motel? I'm sure this building had some significance in GTA
A single player, but can't quite remember what. Anyway, it offers a similar type of arena to that in Location 1, except for the small shrubs and lamp posts which could get in the way during a fight. Again there are stairs leading to the balcony which surrounds the parking area or arena providing a relatively safe place to watch the fights. It's not shown in the above screen shots, but from the third image, just beneath the stairs on the left of the picture is an entrance to the building. Perhaps something like this could be used for what theHolyCow was thinking about when referring to a sort of 'dressing room' for getting weapons and armour? I don't know....
From the above two locations I would probably say Location 1 is my preferred choice. But the event could possibly be held somewhere else in LS (I only had a quick fly over in a heli to survey the area) or even in San Fierro - I haven't checked there for suitable locations. Ideally this event is best hosted inside a building like, as Chillosophy suggested, Big Smoke's Crack Place. But something like this won't be possible until SA:MP 0.2. In the meantime it may be possible to do something with an open environment. If anyone has any other suggestions of possible locations in SF of LS, then please do post
.