The rallies have several purposes:
1. To show support for Trump’s election challenge
2. For those states that have not certified, asking the legislature to investigate the anomalies in the election in their state
3. For those who have certified, to get the legislature to appoint Trump electors instead of Biden electors, or maybe not send electors at all
The state legislators appoint the electors. The Democrats actually encouraged legislatures to replace Trump electors with Hillary electors in 2016. If the legislators in that state determine that the election in their state was faulty, they can decide to send different electors.
This is actually moving forward in Pennsylvania.
Immediately after the election, Kemp was in hiding for days, only to surface in calling for Raffensberger's certification of votes he knew were the subject of much controversy. In other words: Kemp's in on it.
The real question that demands an answer is exactly what Stacy Abrams promised Kemp and Raffensberger to throw Georgia voters under the bus.