Just in time...

Please see OP.
I have to say sorry for the mess with my last mod. The installation issue was due to signing errors. The new market version should work for anyone, I've tested every silly combination.
IF something goes wrong: Just delete/uninstall old calendar, flash the new .zip in Recovery, clear cache and dalvik and it should work.
Really...
And as promised, if anyone likes to mod his own calendar by himself, here are the simple changes (old/new):
In
res/values/bools.xml
<bool name="show_details_in_month">false</bool>
<bool name="show_details_in_month">true</bool>
In
res/values/integers.xml
<integer name="text_size_event_title">14</integer>
<integer name="text_size_event_title">8</integer>
In
smali/com/android/calendar/month/MonthWeekEventsView.smali
Line 240
const/16 v4, 0xc
const/16 v4, 0x8
Line 290
const/4 v0, 0x6
const/4 v0, 0x2
Line 358
const/16 v0, 0xa
const/16 v0, 0x6
Line 362
.line 97
sput v3, Lcom/android/calendar/month/MonthWeekEventsView;->EVENT_SQUARE_BORDER:I
.line 97
const/4 v0, 0x1
sput v0, Lcom/android/calendar/month/MonthWeekEventsView;->EVENT_SQUARE_BORDER:I