Physics students from the Quantitative Sciences Course Union (QSCU) have compiled a list of programs offering research opportunities for physics undergraduates. Below, I have reproduced that list. The links provided were working as of September 20, 2020. Note that this list is not intended to be exhaustive. It is just some of the opportunities that we're currently aware of.
As the various ogranizations update their website, the links below will be broken. If the links aren't working, just search for the name of the program in a search engine.