Oh found a face book page on this missions which says
To complete the event, you should:
- complete UFO collection 5 times;
- complete 'Some Like It Hot' collection 4 times;
- complete 'The Truth Is Out There' collection 2 times.
As a reward, you’ll get the UFO Monument.
Additionally, if you complete 'The Truth Is Out There' collection 4 times, you'll be rewarded with the Crop Circles. Please notice: after completing the event, you won’t be able to continue acquiring items for 'The Truth Is Out There' collection without prior purchasing an UFO Set with Airport Cash.
Needs; nothing sending me what you need and I will return it eventually on a 2 day gift cycle