. After the summer event Halloween begins in 2 months, and then immediately after 2 months the winter event begins.
Summer event - mid August to mid September
=approx. 1.5 months passed=
Halloween event - late October to mid November
=approx. a month passed=
Winter event - mid December - mid January
Examples (year 2014)
20 August to 17 September - Summer event
=42 days later (6 weeks)=
29 October to 19 November - Halloween event
= 28 days later (4 weeks)=
17 December 2014 to 14 January 2015 - Winter event
Conclusion: 6 or 4 weeks are not equal to two months. 4 weeks is not even a whole month.
Examples (year 2017)
19 July to 16 August - Summer event
=71 days later (almost 2.5 months, I agree with your point there, but it's not always 2017 outside...This year it will be less than 2 months again)
26 October to 22 (NB due to technical failures they added 1 week of the event, so "factually" to 29) November - Halloween event
= 3 weeks (2, in fact!!!) later=
13 December 2017 to 10 January 2018 - Winter event
Conclusion: Sometimes Summer event starts early and then there is a huge gap between two events. However, there is only a month between Halloween and Winter events. Always.