Added:
Look at your guild activities and prepare yourself. Always provide 600 tickets. 540 are given by free energy (120 cantina energy refill + 45 bonus, 240 energy refill + 3x45 bonus). For more you need to invest at least crystals.
There are some tricks, e.g. the next day will be "galactic war", you just start the first GW fight and retreat (via settings button). That gives you the daily challenge, but saves the GW for the next day. By this, you can collect 36 GW knots as guild activities.