Below are various links to information about language documentation, summer schools, and general advice
Linguistic Society of Hawaii: Language Documentation Training Center
The Archive of the Indigenous Languages of Latin America (AILLA)
the Pacific And Regional Archive for Digital Sources in Endangered Cultures
Leipzig Glossing Rules (conventions for interlinear morpheme-by-morpheme glosses)
E-MELD School of Best Practice in digital language documentation
CoLang: The Institute on Collaborative Language Research
2020 2022: University of Montana
2018: University of Florida
2016: University of Alaska
2014: The University of Texas at Arlington
2012: University of Kansas
2010: University of Oregon
2008: UC Santa Barbara
The American Indian Language Development Institute's (AILDI) Summer Session
The Linguist List - Postings for Paid and Unpaid Internship Opportunities in Linguistics
Paid Co-op/Internships and Summer Research in University-Based Research Programs
Hunter College's Language Acquisition Research Center Internships and Independent Studies