Thoughts on where to do a post-wedding reception party?

Hi all - my fiancé and I are thinking of doing our wedding ceremony at city hall with a small group of our immediate family. However, we want to throw a post wedding reception party a few weeks later. Ideally we would be looking Fall 2019 and want a low-key venue where we can do a BBQ with picnic tables, have a bonfire, lawn games, fireworks, buy and bring our own alcohol. It won't be a completely casual things, I still want all the cute rustic decor. Any ideas on where this can be done in the Durham Region or what kind of venues you would look for to accomplish this vision? Looking at approx. 150 guests. Thanks in advance.