On June 16th Pokemom Go will have its monthly community day, this month with Larvitar. I normally don’t get involved in them as i am what you would call a casual, despite having been playing since day one. In fact at the Charmander event i caught my first legendary (Zapdos). However I did learn a few things.
First, you are going to want a few pokeballs before the event starts. the last thing you want is to run out and be hoping to hit another pokestop or that it recharges before the next one appears. Second, try to have a couple of lures or incense. The idea here is to catch as many as possible as fast as possible. You will need to catch a lot to evolve it, not to mention you may want to evolve more than one, with so many floating around you will probably catch a couple shiny pokemon.
Third, have some sort of plan. Don’t just wonder around. Go to some place where you know there are stops, bring a drink and have some fun. Best wishes and may the gaming gods bring you glory.