You could always plan a trip to CA. Just come prepared to climb.

I've done six of the doubles out here. They all have long, sustained 3 - 10 mile climbs. Solvang Spring is a lovely first double and in a nice area, with only 6,900 feet of climbing. It was my first double. But it is held in March.
In June you could do the Grand Tour with 8,300 feet of climb. I haven't done that, so can't tell you much about it.
If you want beautiful scenery, Tam in August, Central Coast in May and Eastern Sierra in June would be my picks. They all have more than 10,000 feet of climbing. If you want great support, Knoxville in Sept. is your double.
A lot of people do Davis as their first double. It is very flat at the beginning and end, but still has 8,400 feet of climbing.
Good luck in your search. I hope you can find something closer to home.
V.