Well considering this is the first time I got this event I really don't have enough time (event duration) to get proper amount of mats to do these missions.
The other invasion event last time required 3500 Spores and 300 Cryotic for the mission item crafting which are much more easier/certain drops from missions.
I am not really sure what is supposed to drop from these to make it worth the investment in farming and doing the mission. Did not notice any special item when I did it the first time.