You will have to be quick like a bunny to get the current Monochrome Hunts: Lavender Hill finished before it ends, but you will be nicely rewarded for your efforts.
The FHG Birthday Bash and the Summer Sunrise and Sunsets on the Equator hunts run until the 15th, and the Route 66 Road Trip Hunt ends on the 2oth. So, if you are procrastinator, you may miss out on the fun!
Note: The Ostara Hunt mentioned on the show is not active at this time.
There are lots of hunts, particularly the smaller store/sim hunts. popping up all the time, so check the blog at Hunt SL to stay current.