Before I dedicate a post to each Rush event, here is the official event calendar from the official discord. It will help you know how much time you have to collect resources for the next event. Knowing when the next event is happening help me rank in the Top 5 as a F2P, and later, small spender player.
The calendar starts at the opening of a server and follows the life cycle of a server in number of days since its opening. After 28 days, the server takes a 2-3 days break before starting a new round.
Note that, though the sequence of events (at least Rush events) seem to stay the same, the length of each event may differ. We have entered the second round on EUEN-14 and the Prayer Rush now lasts 7 days. Additionally, the Level Rush only happens once at the opening of the server.
Click to see the Official Event Calendar
Last, it seems some external devs have tried to provide a tool for tracking events on each server. It is somewhat accurate as they react to official updates and might become outdated for some time as we enter a new round.
