Everytime you consume the event, it gives you a random mission out of about 4. So i figured if you don't like the mission your given, you can always just click exit event, and hope you get an easier one. The Scientist ones seem to be the easiest ones of all.
With that said, I'll give tips on the other 3.
Consume Targets:This is easy untill you get the HARD ones, where you have to consume 5 targets. If you can't dash run, then your pretty much screwed. With that said do all of the targets in a millitary disguise so you don't have helicopters shooting rockets at you, and possibly killing the target, or knocking you out of the sky or out of a dash run. Doing the waypoint events for training seems to help build up your speed if you arent a natural platformer.
Infiltrate:Probably the most annoying of the 4, you'll just have to have luck on your side. Sometimes the helicopters stay on your tail for miles, sometimes you'll lose them right away. If your much later in the game, or you've beat it, the helicopters will spawn right on top of the base as soon as you get near it, so youll have to air dash run to the commander, consume him, and hope to god you can run away from the helicopters. A more direct approach, if you can do it fast enough, is to just kill the helicopters on a roof about 4-5 buildings away. 2 Semi/Fully charged Y whip attacks will kill them, but if there's 4 or 5 like I seem to get, kill 2 or 3, then run away.
Destroy Base:This one is so hassle free. In a millitary disguise, jack a tank, or better still grab the rolling thunder tank before the event, drive it to the event, consume it, then re-enter the tank and use it to kill the base in like 3 hits. Other than that, just friendly jack* a tank and blow the $h1T out of the base. Don't bother attacking the other tanks unless they'res more than 3. Also keep moving as much as possible, so the helicopters don't rocket your ass to pissed-off ville
*For those of you who don't know, friendly jacking is where you enter a tank without killing the driver, while in a millitary disguise.