Here are a few events if you are looking for something to do:
On Friday night it's Motorcycles on Main again. Head to downtown Mesa to check out the bikes, browse some shops, and have something to eat.
Of course there is the monthly First Friday Art Walk in downtown Phoenix. Take shuttles around to tour art galleries, for free. There are multiple routes for you to choose depending on your style.
At Kiwanis Park in Tempe you can see their free monthly Movie in the Park. This Friday night's feature is "Happy Feet 2." Movie will start at dusk, or about 7pm.
For some vintage shopping, head to Westworld in Scottsdale on Saturday for the Junk in the Trunk Vintage Market. You can get more details of this event and see some preview photos on their Facebook page.
And for Saturday, here are a few Cinco de Mayo Events:
NOTE: The event posted for Cinco de Mayo in Mesa is NOT accurate. The information was from a previous year. Sorry for the confusion!
Check out the Chandler Cinco de Mayo Festival and Chihuahua Races.
For other ideas, here are a couple of articles from AZ Central that you might want to check out:
Top Cheap Taco Parlors
Big List of Cinco de Mayo Events
18 Restaurants to Celebrate Cinco de Mayo