Things are different this summer. After the challenges of last summer Arlington Parks and Rec wants all camp registrations done through their site.
To register for Middle or Elementary School camps using this link and the Activity numbers 543017 for Middle School and 543016 for Elementary
Bayside registration is just a google form:
MS and ES Day Camps: $300 for full day. Extended hours 7-9am and/or 3:30-6pm for an additional $40 per extension per week.
Bayside Overnight Camp: $500 per camper