Cupcakes are one of the things that are present on many Django Girls workshops, but it doesn’t mean you have to have them or spend a fortune to have the fanciest ones. If you want to have some treats for participants and do that on budget, you could:
Prepare cookies yourself or ask your friends for help.
If you know a friendly bakery who might be interested in sponsoring some sweets - it’s worth to ask them if they would like to be one of the sponsors.
You could try to find sponsors just for that - if the company would like to be more visible, they could order cupcakes with their logo or little flags with the name of their company.
You could skip cupcakes and prepare some veggies and fruits instead. Just buy a bunch of apples, pears or any seasonal tasty fruits that are easy to eat and place them on each table. You could also prepare carrots - it’s a lovely and healthy snack. This is also an amazing and easy option for people with special dietary requirements.