Acalabrutinib and Obinutuzumab for the Treatment of Previously Untreated Follicular Lymphoma or Other Indolent Non-Hodgkin Lymphomas

Inclusion Criteria: * Men and women \>= 18 years of age * Patients will need to have one of the following clinical scenarios: * Previously untreated follicular lymphoma grade 1-3a with low tumor burden by Groupe d'Etude des Lymphomes Folliculaires (GELF) criteria * Previously untreated follicular lymphoma grade 1-3a with high tumor burden by GELF criteria but who are unable or unwilling to receive standard front-line treatment approaches * Previously untreated marginal zone lymphoma, lymphoplasmacytic lymphoma, or any other indolent B-cell lymphoproliferative disorder with low tumor burden by GELF criteria or who are unable/unwilling to receive more intensive front-line treatment * Previously untreated mantle cell lymphoma who would otherwise be appropriate candidates for watchful waiting OR who have symptomatic disease but are not candidates for or decline standard induction approaches * Patients with previously untreated low tumor burden FL (criterion above) must have measurable and/or assessable disease defined as at least one involved lymph node or extranodal disease site that measures \>= 1.5cm in greatest diameter * Patients who meet inclusion criteria above are eligible as long as they meet one of the following criteria for measurable/assessable disease: * At least one involved lymph node or extranodal disease site measuring \> 1.5cm in greatest diameter * Pathologically-confirmed bone marrow or peripheral blood involvement that can be reassessed for res…