Clarifying a couple of points here.
Sparks are every 2 weeks starting tomorrow (half a spark per week), and there is a tutorial quest that grants an additional half spark. This means players can get their first full spark the same week as the release of the patch, and the second spark will be creatable on week 3 (the week after season 2 starts), etc.
For any characters that fall behind on Spark creation, extra Sparks have a higher chance to drop from sources like:
- M+ end-of-dungeon chests
- PvP Wins
- The new World Boss
- Your first time defeating the dragon boss of the Fyrakk Assault
- The public event Researchers Under Fire
- Niffen Cave Dives
- Aberrus raid bosses
until the character is caught up.