Open the map and add this to the map LUA script.
H55_SPMapDailyEvent = 1;
function H55_SPMap_DailyEvent()
sleep(5);
@OpenCircleFog(0, 0, 0, 9999, PLAYER_1);
sleep(5);
@OpenCircleFog(0, 0, 1, 9999, PLAYER_1);
end;
It should open the map (top and underground) for player 1 on day 1 (try skipping a day if it does not happen on day 1)