There is an ongoing (till 09/15) drops campaign which –for whatever reason– wasn’t officially announced by Wargaming, with the following items:
• 36x large Repair kit
• 36x large First Aid kit
• 36x Consumables (for various nations)
• 24x 50% Combat XP reserves for 1 hour (expirable after 7 days)
• 24x 200% Free & Crew XP reserves for 1 hour (expirable after 7 days)
To receive them all, you need to watch 2 hours for each of the following contributors’ streams (listed first are those who tend to stream less regulatory/often, so you should prioritize if multiple streams are online):
• https://www.twitch.tv/remi_id
• https://www.twitch.tv/awesomeepicguys
• https://www.twitch.tv/newmultishow
• https://www.twitch.tv/mailand
• https://www.twitch.tv/mouzakrobat
• https://www.twitch.tv/marty_vole
• https://www.twitch.tv/damiensgaming
• https://www.twitch.tv/talkto_megoose
• https://www.twitch.tv/dezgamez
• https://www.twitch.tv/dakillzor
• https://www.twitch.tv/skill4ltu
• https://www.twitch.tv/quickybaby
pro-tip: if you’re a casual player or know you won’t play for several days, you don’t need to ‘Claim Now’ the drops right away (otherwise personal reserves may expire). You have more than a week after watching the stream to do so
source: reddit