Wedding in Austin TX, I would say on a budget, but there really isn't a budget.?

My 'baby's daddy' and I have been together for 6 years and have wanted to get married almost every year. We have a 5 year old son together, are very much in love and want to get married. However, we will have to fund it ourselves and we never have any extra money. We also don't want to go down to the courthouse and get married. We need ideas on the cheapest possible ways to get married and maybe have some music too. Austin is the Live Music Capitol of the World and we thought about getting married on a day when a good band/artist was playing and having an after party at the place, but it is becoming difficult to plan around that. Any ideas?? Thanks for taking the time to post your ideas. We really appreciate it.