Hi there!
1. By that, do you mean like a cutscene that could happen between 5pm and 6pm for example? If so yes, you'll just need to set it so that the event only triggers when the Hours variable is above 5 but below 6!
2. There are multiple seeds! The demo features 4, but you can set up as many as you like. The player switches between seeds and tools by pressing the Page Up button (this can also be customised to whatever button you'd like), and their currently selected seed/tool will appear in the top right. :D