[[ABK]Antonio]

You could try this out

pawn Code:

public OnPlayerCommandReceived(playerid, cmdtext[])
{
    if(IsInEvent[playerid] && strfind(cmdtext, "LeaveEvent", true) == -1)
    {
        SendClientMessage(playerid, 0xCC0000AA, "You can't use commands in an event!")
        return 0;
    }
    return 1;
}

Also, PVars are basically the same as new IsInEvent[MAX_PLAYERS] = 0;

pawn Code:

CMD:vartest(playerid)
{
    SetPVarInt(playerid, "SomeVar", 0);
    printf("Somevar: %i", GetPVarInt(playerid, "SomeVar"));
    return 1;
}

That's an example