Start reworking FF60 porting schedule.

wiki/src/contribute/calendar.mdwn

@@ -31,13 +31,15 @@ All times are referenced to Berlin and Paris time.
 * 2018-07-21 to 2018-07-23: bootstrap the work on porting Tails to Tor
   Browser based on Firefox 60ESR ([[!tails_ticket 15023]]) — anonym
 
-* 2018-08-01 to 2018-08-15: port Tails to Tor Browser based on Firefox
+* 2018-08-01 to 2018-08-09: port Tails to Tor Browser based on Firefox
   60ESR ([[!tails_ticket 15023]]) — anonym
-  - 2018-08-08, 2018-08-09, 2018-08-13, 2018-08-14: intrigeri helps
+  - 2018-08-08 and 2018-08-09: intrigeri reviews and merges
 
 * 2018-08-06, 19:00: [[Contributors meeting|contribute/meetings]]
 
-* 2018-08-17: Release 3.9~rc1 — anonym
+* 2018-08-10: Build and upload tentative 3.9~rc1 ISO image — anonym
+
+* 2018-08-13: Release 3.9~rc1 — anonym
 
 * 2018-08-21: **Release 3.9** (Firefox 60.2, major release) — anonym is the RM
   - includes VeraCrypt support + major Additional Software Packages improvements