I just had a look and it turns out that there is a regular Saturday morning (8 am) 5k fun run around the lake near here (Lake Ginnandera, not the bigger lake I like to walk around). They started in April this year and have an average of about 50 runners each week, last week 63 with 26 new people. They post photos and results on their website. Sounds good. But the average time is under 30 mins and my best is over 50! Hmm, definitely train for it first. The fastest guy has done it in 14 mins. He'd be zooming back past me when I had barely started. But I am just a beginner.