BUG: Fix and test getting all default calendars

zipline/utils/calendars/exchange_calendar_bmf.py

@@ -202,7 +202,7 @@ class BMFExchangeCalendar(TradingCalendar):
 
     @property
     def tz(self):
-        return timezone("America/Sao_Paolo")
+        return timezone("America/Sao_Paulo")
 
     @property
     def open_time(self):

zipline/utils/calendars/exchange_calendar_lse.py

@@ -27,6 +27,7 @@ MayBank = Holiday(
     "Early May Bank Holiday",
     month=5,
     offset=DateOffset(weekday=MO(1)),
+    day=1,
 )
 # Spring bank holiday
 SpringBank = Holiday(