The beginning of the 2021-22 school year is just over a month away in Watertown, but some significant details remains uncertain due to the increased number of cases of COVID-19 in Massachusetts, particularly the Delta Variant. Superintendent Dede Galdston told the School Committee Monday night that she plans for in-person learning for all students, but there could be some virus-related requirements such as regular testing and wearing of masks. The final decision will come later this month. “I think it is too fluid, with what’s going on with the virus,” Galdston said. “As we get to mid- to later in August I will make a recommendation based on feedback — from the Health Department, from our teachers, from our families — to determine what is going to be the safest options for our students as we return to school on Sept.