The Warframe team is encouraging players to check in beginning today and running throughout the weekend for a special bonus event that will yield double credits during missions and special "high-yield" alerts that where players can score some awesome gear.
The full schedule is as follows:
Alert 1 September 17 at 2 p.m. EDT until September 18 at 2 p.m. EDT Tessera (Venus): The Proxy Rebellion. Reward: Orokin Catalyst + 10,000 Credits
Alert 2 September 18 at 2 p.m. EDT until September 19 at 2 p.m. EDT (Martialis) Mars: The Proxy Rebellion. Reward: Orokin Reactor + 10,000 Credits Alert 3 September 19 at 2 p.m. EDT until September 20 at 2 p.m. EDT Palus (Pluto) The Proxy Rebellion. Reward: Wraith Twin Vipers with Weapon Slot + 50,000 Credits
Alert 4 September 20 at 2 p.m. EDT until September 21 at 2 p.m. EDT Io (Jupiter) The Proxy Rebellion. Reward: 25 Rare Mod Cores + 10,000 Credits
Find out more on the Warframe site.