You won't remember it. Collect the ideas into a loose-leaf notebook or file system where you can look and study what you have written. Review your notebook from time to time. The review may cause you to have another epiphany. Probably the key selling point for going to a professional conference is to be able to network and talk to people about ideas.
People come to conferences often looking for solutions.
The combination of their searching and your searching may create opportunities for idea synthesis. Write them down and put them in your notebook. Go where people are that do the work that you do and talk. Remember that an unmet need is an opportunity. A good source for finding unmet needs is to use both supplier and customer focus groups and ask them questions.