Wonderful, I am glad to hear that there is a suit and that you will be able to pursue your intervention. Having the aunt on board and a long history of having cared for the children and establishing a relationship with them should go along way in support of your case.
2. However, they are not meeting again until August, and I want to legally visit and do things with the kids this summer. If I intervene now will they have to hear me now, or not till August.
When a party wants "interim" visitation and/or an earlier hearing date, that can be requested in the paperwork along with an explanation about to why it is important. The court has the discretion to set an earlier hearing date or grant interim visitation or both, but it often depends on the court's calendar and how convincing the argument is that it is in the best interest of the children to allow visitation pending a hearing. (Keep in mind that the court will consider not only its own calendar, but that of the other attorneys in the case as well.) Getting an earlier date should be feasible, since it is only May, but there is no guarantee.
3. And If I intervene to I have to have an Attorney to do so?
An attorney is always ideal, but if you cannot afford one you are not prohibited from filing on your own. The bar association creates forms like these for individuals filing pro se
(without attorneys) to use.